| Genus |
Order |
Reference |
Note |
Nomenclature |
| H | |
| Haackgreerius | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Haageocereus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Habenaria | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Haberlea | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Habia | Passeriformes | Clements (2007) | . | ICZN |
| Hablitzia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Habranthus | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Habrochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Habrodon | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Habromys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Habroneuron | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Habropetalum | Caryophyllales | Mabberley (2008) | Dioncophyllaceae. | ICBN |
| Habroptila | Gruiformes | Clements (2007) | . | ICZN |
| Habrosanthus | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Habrosia | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Habrotrocha | Bdelloida | Segers (2002); Segers (2007) | . | ICZN |
| Hachettea | Santalales | Mabberley (2008) | Balanophoraceae. | ICBN |
| Hackelia | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Hackelochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hackenbergia | Cyrtolophosidida | Lynn (2008) | . | ICZN |
| Hacquetia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Hadalanthus | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Haddonia | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Haddoniidae. | ICZN |
| Hadromys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Haeckelia | Cydippida | Harbison & Madin (1982) | . | ICZN |
| Haeckeliana | Phaeocalpida | Takahashi & Anderson (2000) | . | ICZN |
| Haeckeria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Haegiela | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Haemanthus | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Haematobacter | Rhodobacterales | Helsel et al. (2007) | . | ICNB |
| Haematocarpus | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Haematodendron | Magnoliales | Mabberley (2008) | Myristicaceae. | ICBN |
| Haematoderus | Passeriformes | Clements (2007) | . | ICZN |
| Haematophagus | Haptorida | Lynn (2008) | . | ICZN |
| Haematopus | Charadriiformes | Clements (2007) | . | ICZN |
| Haematortyx | Galliformes | Clements (2007) | . | ICZN |
| Haematospiza | Passeriformes | Clements (2007) | . | ICZN |
| Haematostaphis | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Haematostemon | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Haematoxylum | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Haemescharia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Haemobartonella | Mycoplasmatales | Garrity et al. (2005) | . | ICNB |
| Haemodorum | Commelinales | Mabberley (2008) | Haemodoraceae. | ICBN |
| Haemodracon | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Haemogregarina | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Haemohormidium | Piroplasmorida | Perkins et al. (2000) | . | ICZN |
| Haemophilus | Pasteurellales | Garrity et al. (2005) | . | ICNB |
| Haemoproteus | Haemospororida | Perkins et al. (2000) | . | ICZN |
| Haenianthus | Lamiales | Mabberley (2008) | Oleaceae. | ICBN |
| Haeromys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Haesselia | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Hafnia | Enterobacteriales | Garrity et al. (2005) | . | ICNB |
| Hagenbachia | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Hagenia | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Hageniella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Hagenowinoides | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Textulariellidae. | ICZN |
| Hagsatera | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hahella | Oceanospirillales | Garrity et al. (2005) | . | ICNB |
| Hainardia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Haitia | Myrtales | Mabberley (2008) | Lythraceae. | ICBN |
| Hakaria | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Hakea | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Hakonechloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Halacsya | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Haladaptatus | Halobacteriales | Savage et al. (2007) | . | ICNB |
| Halaelurus | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Halalkalibacillus | Bacillales | Echigo et al. (2007) | . | ICNB |
| Halalkalicoccus | Halobacteriales | Xue et al. (2005) | . | ICNB |
| Halammohydra | Actinulida | Bouillon et al. (2006) | . | ICZN |
| Halanaerobacter | Halanaerobiales | Garrity et al. (2005) | . | ICNB |
| Halanaerobaculum | Halanaerobiales | Hedi et al. (2009) | . | ICNB |
| Halanaerobium | Halanaerobiales | Garrity et al. (2005) | . | ICNB |
| Halanthium | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Halarachnion | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Halarchaeum | Halobacteriales | Minegishi et al. (2010) | . | ICNB |
| Halarsenatibacter | Halanaerobacteriales | Switzer Blum et al. (2009) | . | ICNB |
| Halcampa | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Halcampactis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Halcampaster | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Halcampella | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Halcampogeton | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Halcampoides | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Halcurias | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Halcyon | Coraciiformes | Clements (2007) | . | ICZN |
| Haldina | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Halechiniscus | Arthrotardigrada | Kinchin (1994) | . | ICZN |
| Halecium | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Halenia | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Halerpestes | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Halesia | Ericales | Mabberley (2008) | Styracaceae. | ICBN |
| Halfordia | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Halgania | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Haliactis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Haliaeetus | Falconiformes | Clements (2007) | . | ICZN |
| Haliangium | Myxococcales | Garrity et al. (2005) | . | ICNB |
| Halianthella | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Haliarachne | Oscillatoriales | Hoffmann et al. (2005) | . | ICBN |
| Haliastur | Falconiformes | Clements (2007) | . | ICZN |
| Halichaetonotus | Chaetonotida | Balsamo et al. (2009); Hummon & Todaro (2010) | . | ICZN |
| Halichoerus | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Halichondria | Halichondrida | Erpenbeck & Van Soest (2002) | . | ICZN |
| Halichrysis | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Haliclona | Haplosclerida | De Weerdt (2002) | . | ICZN |
| Haliclonissa | Haplosclerida | Desqueyroux-Faúndez & Valentine (2002) | . | ICZN |
| Haliclystus | Stauromedusae | Kramp (1961) | . | ICZN |
| Halicnemia | Halichondrida | Hooper (2002) | . | ICZN |
| Halicnide | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Halicometes | Hadromerida | Sarà (2002) | . | ICZN |
| Halicornopsis | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Halicreas | Trachymedusae | Bouillon et al. (2006) | . | ICZN |
| Halicryptus | Halicryptomorpha | Adrianov & Malakhov (1996) | . | ICZN |
| Haliea | Alteromonadales | Urios et al. (2008) | . | ICNB |
| Halimanemertes | Eumonostilifera | Gibson (1995); Chernyshev (2003) | . | ICZN |
| Halimedusa | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Halimiocistus | Malvales | Mabberley (2008) | xHalimiocistus. Cistus x Halimium hybrids. Cistaceae. | ICBN |
| Halimiphyllum | Zygophyllales | Mabberley (2008) | Zygophyllaceae. | ICBN |
| Halimium | Malvales | Mabberley (2008) | Cistaceae. | ICBN |
| Halimocnemis | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Halimocyathus | Stauromedusae | Kramp (1961) | . | ICZN |
| Halimodendron | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Halimolobos | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Halioglobus | | Park et al. (2012) | Domain Bacteria - Phylum Proteobacteria - Class Gammaproteobacteria. | ICNB |
| Haliommatidium | Symphyacanthida | Febvre et al. (2000) | . | ICZN |
| Halioticida | | Muraosa et al. (2009) | Domain Eucarya - Kingdom Straminipila - Phylum Oomycota. | ICBN |
| Haliphthoros | | Dick (2001); Kirk et al. (2008); Muraosa et al. (2009) | Domain Eucarya - Kingdom Straminipila - Phylum Oomycota. | ICBN |
| Halipteris | Pennatulacea | Williams (1995) | . | ICZN |
| Haliptilon | Corallinales | Schneider & Wynne (2007); Wynne & Schneider (2010) | Later synonym of Jania. | ICBN |
| Halisarca | Halisarcida | Bergquist & Cook (2002) | . | ICZN |
| Haliscera | Trachymedusae | Bouillon et al. (2006) | . | ICZN |
| Haliscomenobacter | Sphingobacteriales | Garrity et al. (2005) | . | ICNB |
| Halisiphonia | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Halistemma | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Halitholus | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Halitiara | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Halitiarella | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Halitrephes | Trachymedusae | Bouillon et al. (2006) | . | ICZN |
| Hallangia | Acoela | Dörjes (1968); Faubel & Noreña (2001) | . | ICZN |
| Hallasia | Zygnematales | Gontcharov (2008) | . | ICBN |
| Halleorchis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Halleria | Lamiales | Mabberley (2008) | Stilbaceae. | ICBN |
| Hallianthus | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Halmomises | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Haloactinobacterium | Micrococcales | Tang et al. (2010); Ludwig et al. (2012) | . | ICNB |
| Haloactinopolyspora | Jiangellales | Tang et al. (2011); Ludwig et al. (2012) | . | ICNB |
| Haloactinospora | Streptosporangiales | Tang et al. (2008); Ludwig et al. (2012) | . | ICNB |
| Haloarchaeobius | Halobacteriales | Makhdoumi-Kakhki et al. (2012) | . | ICNB |
| Haloarcula | Halobacteriales | Garrity et al. (2005) | . | ICNB |
| Halobacillus | Bacillales | Garrity et al. (2005) | . | ICNB |
| Halobacterium | Halobacteriales | Garrity et al. (2005) | . | ICNB |
| Halobacteroides | Halanaerobiales | Garrity et al. (2005) | . | ICNB |
| Halobaculum | Halobacteriales | Garrity et al. (2005) | . | ICNB |
| Halobaena | Procellariiformes | Clements (2007) | . | ICZN |
| Halobellus | Halobacteriales | Cui et al. (2011) | . | ICNB |
| Halobiforma | Halobacteriales | Garrity et al. (2005) | . | ICNB |
| Halobiotus | Parachela | Kinchin (1994) | . | ICZN |
| Halocafeteria | | Park et al. (2010) | Domain Eucarya - Kingdom Straminipila - Phylum Bicosoecacea - Class Bicoecea. | ICZN |
| Halocarpus | Araucariales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Halocella | Halanaerobiales | Garrity et al. (2005) | . | ICNB |
| Halocella | Phaeogymnocellida | Takahashi & Anderson (2000) | . | ICZN |
| Halocharis | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Halochromatium | Chromatiales | Garrity et al. (2005) | . | ICNB |
| Haloclava | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Halocnemum | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Halococcus | Halobacteriales | Garrity et al. (2005) | . | ICNB |
| Halocoryne | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Halocrusticida | Myzocytiopsidales | Dick (2001); Kirk et al. (2008); Muraosa et al. (2009) | Later synonym of Crypticola. | ICBN |
| Halocynthia | Stolidobranchia | Monniot & Monniot (1972); Monniot (2001) | Pyuridae. | ICZN |
| Halodaphnea | | Dick (2001); Kirk et al. (2008) | Domain Eucarya - Kingdom Straminipila - Phylum Oomycota. | ICBN |
| Halodule | Alismatales | Mabberley (2008) | Cymodoceaceae. | ICBN |
| Haloechinothrix | Pseudonocardiales | Tang et al. (2010); Ludwig et al. (2012) | . | ICNB |
| Haloferax | Halobacteriales | Garrity et al. (2005) | . | ICNB |
| Haloferula | Verrucomicrobiales | Yoon et al. (2008) | . | ICNB |
| Halofolliculina | Heterotrichida | Lynn (2008) | nomen nudum. | ICZN |
| Halogeometricum | Halobacteriales | Garrity et al. (2005) | . | ICNB |
| Halogeton | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Haloglycomyces | Glycomycetales | Guan et al. (2009); Ludwig et al. (2012) | . | ICNB |
| Halogranum | Halobacteriales | Cui et al. (2010) | . | ICNB |
| Halolactibacillus | Bacillales | Ishikawa et al. (2005) | . | ICNB |
| Halolamina | Halobacteriales | Cui et al. (2011) | . | ICNB |
| Halomarina | Halobacteriales | Inoue et al. (2011) | . | ICNB |
| Halomethanococcus | Methanosarcinales | Garrity et al. (2005) | Later synonym of Methanohalophilus. | ICNB |
| Halomicrobium | Halobacteriales | Garrity et al. (2005) | . | ICNB |
| Halomicronema | Pseudanabaenales | Hoffmann et al. (2005) | . | ICBN |
| Halomitra | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Halomonas | Oceanospirillales | Garrity et al. (2005) | . | ICNB |
| Halonatronum | Halanaerobiales | Garrity et al. (2005) | . | ICNB |
| Halonotius | Halobacteriales | Burns et al. (2010) | . | ICNB |
| Halopegia | Zingiberales | Mabberley (2008) | Marantaceae. | ICBN |
| Halopelagius | Halobacteriales | Cui et al. (2010) | . | ICNB |
| Halopeltis | Rhodymeniales | Wynne & Schneider (2010) | . | ICBN |
| Halopenitus | Halobacteriales | Amoozegar et al. (2012) | . | ICNB |
| Halopeplis | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Halophila | Alismatales | Mabberley (2008) | Hydrocharitaceae. | ICBN |
| Halophilodinium | | Fensome et al. (1993) | Domain Eucarya - Phylum Dinozoa - Superclass Dinokaryota. | ICBN |
| Halophytophthora | Peronosporales | Cooke et al. (2000); Dick (2001); Kirk et al. (2008); Bala et al. (2010) | . | ICBN |
| Halophytum | Caryophyllales | Mabberley (2008) | Halophytaceae. | ICBN |
| Halopiger | Halobacteriales | Gutiérrez et al. (2007) | . | ICNB |
| Halopithys | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Haloplanus | Halobacteriales | Bardavid et al. (2007) | . | ICNB |
| Haloplasma | Haloplasmatales | Antunes et al. (2008) | . | ICNB |
| Haloplegma | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Halopsis | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Halopteris | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Halopyrum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Haloquadratum | Halobacteriales | Burns et al. (2007) | . | ICNB |
| Haloragis | Saxifragales | Mabberley (2008) | Haloragaceae. | ICBN |
| Haloragodendron | Saxifragales | Mabberley (2008) | Haloragaceae. | ICBN |
| Halorhabdus | Halobacteriales | Garrity et al. (2005) | . | ICNB |
| Halorhodospira | Chromatiales | Garrity et al. (2005) | . | ICNB |
| Halorientalis | Halobacteriales | Cui et al. (2011) | . | ICNB |
| Halorubrobacterium | Halobacteriales | Garrity et al. (2005) | Later synonym of Halorubrum. | ICNB |
| Halorubrum | Halobacteriales | Garrity et al. (2005) | . | ICNB |
| Halosacciocolax | Palmariales | Schneider & Wynne (2007); Wynne & Schneider (2010) | Later synonym of Rhodophysema. | ICBN |
| Halosaccion | Palmariales | Schneider & Wynne (2007) | . | ICBN |
| Halosarcia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Halosarcina | Halobacteriales | Savage et al. (2008) | . | ICNB |
| Halosciastrum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Halosia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Halosicyos | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Halosimplex | Halobacteriales | Garrity et al. (2005) | . | ICNB |
| Halosphaera | Pyramimonadales | Moestrup (2000) | . | ICBN |
| Halospina | Oceanospirillales | Sorokin et al. (2006) | . | ICNB |
| Halospirulina | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Halostachys | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Halostagnicola | Halobacteriales | Castillo et al. (2006) | . | ICNB |
| Halostylodinium | | Horiguchi et al. (2000) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Dinozoa - Class Dinophyceae. | ICBN |
| Halotalea | Oceanospirillales | Ntougias et al. (2007) | . | ICNB |
| Haloterrigena | Halobacteriales | Garrity et al. (2005) | . | ICNB |
| Halothamnus | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Halothece | Chroococcales | Garcia-Pichel et al. (1998); Hoffmann et al. (2005); Margheri et al. (2008); Oren (2009) | Although Oren (2009) proposed "Halotheca" is the correct speclling under ICBN, "Halothece" is correct spelling under ICBN (see Art 20.1 and 60A.1). | ICBN |
| Halothermothrix | Halanaerobiales | Garrity et al. (2005) | . | ICNB |
| Halothiobacillus | Chromatiales | Garrity et al. (2005) | . | ICNB |
| Halotis | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Halovenus | Halobacteriales | Makhdoumi-Kakhki et al. (2012) | . | ICNB |
| Halovibrio | Oceanospirillales | Sorokin et al. (2006); Sorokin & Tindall (2006) | Not synonymous to Halomonas (Request for opinion). | ICNB |
| Halovivax | Halobacteriales | Castillo et al. (2006a) | . | ICNB |
| Haloxylon | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Halteria | Sporadotrichida | Lynn (2008) | . | ICZN |
| Halterioforma | Sporadotrichida | Lynn (2008) | nomen oblitum. | ICZN |
| Haltidytes | Chaetonotida | Balsamo et al. (2009) | . | ICZN |
| Halurus | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Halydictyon | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Halymenia | Cryptonemiales | Silva (2002); Schneider & Wynne (2007) | . | ICBN |
| Halyphysema | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Rhabdamminidae. | ICZN |
| Hamacantha | Poecilosclerida | Hajdu (2002) | . | ICZN |
| Hamadaea | Micromonosporales | Ara et al. (2008); Ludwig et al. (2012) | . | ICNB |
| Hamadryas | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Hamamelis | Saxifragales | Mabberley (2008) | Hamamelidaceae. | ICBN |
| Hamatocaulis | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Hamatostrepta | Jungermanniales | Söderström et al. (2010) | . | ICBN |
| Hamelia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Hamigera | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Hamilcoa | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Hamiltosporidium | Microsporida | Haag et al. (2011) | . | ICZN |
| Hamirostra | Falconiformes | Clements (2007) | . | ICZN |
| Hammatolobium | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hammeria | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Hammondia | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Hampea | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Hampeella | Ptychomniales | Goffinet et al. (2009) | . | ICBN |
| Hamptophryne | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Hanabusaya | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Hanburia | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Hancea | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Hanceola | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Hancockia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hancornia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Handelia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Handeliella | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Handeliobryum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Handeliodendron | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Handleyomys | Rodentia | Musser & Carleton (2005) | . | ICZN |
| Handroanthus | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Hanguana | Commelinales | Mabberley (2008) | Hanguanaceae. | ICBN |
| Haniffia | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Hannafordia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Hannonia | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Hansenia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Hanseniella | Malpighiales | Mabberley (2008) | Podostemaceae. | ICBN |
| Hansenisca | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Gavelinellidae. | ICZN |
| Hansiella | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Hanslia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hansschlegelia | Rhizobiales | Ivanova et al. (2007) | . | ICNB |
| Hanumantharaorhynchus | Echinorhynchida | Amin (1985) | . | ICZN |
| Hanusia | Pyrenomonadales | Clay et al. (1999); Novarino (2003); Özdikmen (2009) | Later homonym and substituted by Phia under ICZN, but not under ICZN. | ICBN |
| Hanzawaia | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Gavelinellidae. | ICZN |
| Hapalemur | Primates | McKenna & Bell (1997) | . | ICZN |
| Hapaline | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Hapalomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Hapalopsittaca | Psittaciformes | Clements (2007) | . | ICZN |
| Hapaloptila | Galbuliformes | Clements (2007) | . | ICZN |
| Hapalorchis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hapalosiphon | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Haplanthodes | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Haploangium | Myxococcales | Garrity et al. (2005) | . | ICNB |
| Haploblepharus | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Haplocarpha | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Haplocaulus | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Haplocelis | Acoela | Dörjes (1968) | . | ICZN |
| Haplocercus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Haplocercus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Haplochelidon | Passeriformes | Clements (2007) | . | ICZN |
| Haplochorema | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Haplocladium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Haploclathra | Malpighiales | Mabberley (2008) | Guttiferae. | ICBN |
| Haplocoelopsis | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Haplocoelum | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Haplodasya | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Haplodinium | Prorocentrales | Fensome et al. (1993) | . | ICBN |
| Haplodiscus | Acoela | Dörjes (1968); Faubel & Noreña (2001); Hooge & Tyler (2005) | . | ICZN |
| Haploesthes | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Haplognathia | Filospermoidea | Sørensen (2002) | . | ICZN |
| Haplogonaria | Acoela | Dörjes (1968); Faubel & Noreña (2001); Hooge (2003) | . | ICZN |
| Haplohexapodibius | Parachela | Kinchin (1994) | . | ICZN |
| Haplohymenium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Haplolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Haplolobus | Sapindales | Mabberley (2008) | Burseraceae. | ICBN |
| Haplomacrobiotus | Parachela | Kinchin (1994) | . | ICZN |
| Haplomitrium | Calobryales | Crandall-Stotler et al. (2009) | . | ICBN |
| Haplonycteris | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Haplopappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Haplophaedia | Apodiformes | Clements (2007) | . | ICZN |
| Haplophragmoides | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Haplophragmoididae. | ICZN |
| Haplophyllum | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Haplophyton | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Haploposthia | Acoela | Dörjes (1968); Faubel & Noreña (2001) | . | ICZN |
| Haplopteris | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Haplorhus | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Haplormosia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Haplosciadium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Haplosphaera | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Haplospiza | Passeriformes | Clements (2007) | . | ICZN |
| Haplosporidium | Haplosporida | Bass et al. (2009) | . | ICZN |
| Haplostachys | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Haplostichanthus | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Haplotaenium | Desmidiales | Gontcharov (2008) | . | ICBN |
| Haplotestis | Acoela | Dörjes (1968); Faubel & Noreña (2001) | . | ICZN |
| Haplothismia | Dioscoreales | Mabberley (2008) | Thismiaceae. | ICBN |
| Haplozoon | | Fensome et al. (1993); Skovgaard et al. (2007) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Dinozoa - Class Dinophyceae. Former Blastodiniales. | ICBN |
| Hapsidophrys | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Haptanthus | Buxales | Mabberley (2008) | Haptanthaceae. | ICBN |
| Haptocarpum | Brassicales | Mabberley (2008) | Cleomaceae. | ICBN |
| Haptoglossa | Haptoglossales | Dick (2001); Kirk et al. (2008) | Haptoglossaceae. | ICBN |
| Haptophrya | Astomatida | Lynn (2008) | . | ICZN |
| Haptophryopsis | Astomatida | Lynn (2008) | . | ICZN |
| Haptotrichion | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Haraella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Haraldia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Haraldiophyllum | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Haramonas | Raphidomonadales | Horiguchi (1996) | . | ICBN |
| Harbouria | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Hardella | Testudinata | Vitt & Caldwell (2009) | Geomydidae. | ICZN |
| Hardenbergia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hardwickia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Harenactis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Harendraia | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Harfordia | Caryophyllales | Mabberley (2008) | Polygonaceae. | ICBN |
| Harleya | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Harleyodendron | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Harmandia | Santalales | Mabberley (2008) | Olacaceae. | ICBN |
| Harmocoma | Hypocomatida | Lynn (2008) | . | ICZN |
| Harmonia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Harmsia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Harmsiodoxa | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Harmsiopanax | Apiales | Mabberley (2008) | Araliaceae. | ICBN |
| Harnackia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Haroldiella | Rosales | Mabberley (2008) | Urticaceae. | ICBN |
| Harpachne | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Harpactes | Trogoniformes | Clements (2007) | . | ICZN |
| Harpagonella | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Harpagophytum | Lamiales | Mabberley (2008) | Pedaliaceae. | ICBN |
| Harpagus | Falconiformes | Clements (2007) | . | ICZN |
| Harpalejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Harpalyce | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Harpanthus | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Harpephyllum | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Harperia | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Harperocallis | Alismatales | Mabberley (2008) | Tofieldiaceae. | ICBN |
| Harpesaurus | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Harpia | Falconiformes | Clements (2007) | . | ICZN |
| Harpiocephalus | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Harpochilus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Harpochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Harpullia | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Harpyhaliaetus | Falconiformes | Clements (2007) | . | ICZN |
| Harpyionycteris | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Harpyopsis | Falconiformes | Clements (2007) | . | ICZN |
| Harrimanella | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Harrimania | Helminthomorpha | Benito (1982) | Harrimaniidae. | ICZN |
| Harringia | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Harriotta | Chimaeriformes | Nelson (2006) | . | ICZN |
| Harrisella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Harrisia | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Harrisonia | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Harrysmithia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Hartertula | Passeriformes | Clements (2007) | . | ICZN |
| Hartlaubella | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Hartleya | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Hartliella | Lamiales | Mabberley (2008) | Linderniaceae. | ICBN |
| Hartmannella | Euamoebida | Rogerson & Patterson (2000); Smirnov et al. (2005) | . | ICZN |
| Hartmannula | Dysteriida | Lynn (2008) | . | ICZN |
| Hartmannulopsis | Dysteriida | Lynn (2008) | . | ICZN |
| Hartmanthus | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Hartmeyeria | Stolidobranchia | Monniot & Monniot (1972) | Pyuridae. | ICZN |
| Hartogiopsis | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Hartwrightia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Harungana | Malpighiales | Mabberley (2008) | Hypericaceae. | ICBN |
| Harveya | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Harveyella | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Hasllibacter | Rhodobacterales | Kim et al. (2012) | . | ICNB |
| Hassallia | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Hasseltia | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Hasseltiopsis | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Hastarcon | Exogenida | Lynn (2008) | . | ICZN |
| Hastatella | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Hastigerina | Globigerinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hastigerinidae. | ICZN |
| Hastigerinopsis | Globigerinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hastigerinidae. | ICZN |
| Hastingsia | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Hataia | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Hatena | Kathablepharidida | Okamoto & Inouye (2006) | . | ICZN |
| Hatiora | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Hatschbachiella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hattoria | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Hattorianthus | Fossombroniales | He-Nygrén et al. (2006); Crandall-Stotler et al. (2009) | . | ICBN |
| Hattoriella | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Hattorioceros | Notothyladales | Renzaglia et al. (2009) | . | ICBN |
| Hattoriolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Hauerina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Haumania | Zingiberales | Mabberley (2008) | Marantaceae. | ICBN |
| Haumaniastrum | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Hausmanniella | Colpodida | Lynn (2008) | . | ICZN |
| Haussknechtia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Hauya | Myrtales | Mabberley (2008) | Onagraceae. | ICBN |
| Havardia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hawaiia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Hawkesiophyton | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Haworthia | Asparagales | Mabberley (2008) | Asphodelaceae. | ICBN |
| Haya | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Hayaster | Coccolithales | Jordan et al. (2004) | Calcidiscaceae. | ICBN |
| Haynesina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Nonionidae. | ICZN |
| Hazardia | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Hazardia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hebanthe | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Hebanthodes | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Hebantia | Polytrichales | Goffinet et al. (2009) | . | ICBN |
| Hebeclinium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hebella | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Hebenstretia | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Hebepetalum | Malpighiales | Mabberley (2008) | Linaceae. | ICBN |
| Heberdenia | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Hebesoma | Neoechinorhynchida | Amin (1985) | . | ICZN |
| Hebestigma | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hebesuncus | Parachela | Kinchin (1994) | . | ICZN |
| Hecastocleis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hecatostemon | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Hechtia | Poales | Mabberley (2008) | Bromeliaceae. | ICBN |
| Hecistopteris | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Heckeldora | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Hedbergia | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Hedenaesia | Hypnales | Huttunen & Ignatov (2010) | . | ICBN |
| Hedeoma | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Hedera | Apiales | Mabberley (2008) | Araliaceae. | ICBN |
| Hederorkis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hedosyne | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hedraianthera | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Hedraiophrys | Gymnosphaerida | Mikrjukov et al. (2000); Adl et al. (2005) | Gymnosphaeridae. | ICZN |
| Hedriocystis | Desmothoracida | Mikrjukov et al. (2000); Adl et al. (2005) | Clathrulinidae. | ICZN |
| Hedstromia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Hedwigia | Hedwigiales | Goffinet et al. (2009) | . | ICBN |
| Hedwigidium | Hedwigiales | Goffinet et al. (2009) | . | ICBN |
| Hedycarya | Laurales | Mabberley (2008) | Monimiaceae. | ICBN |
| Hedychium | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Hedydipna | Passeriformes | Clements (2007) | . | ICZN |
| Hedyosmum | Chloranthales | Mabberley (2008) | Chloranthaceae. | ICBN |
| Hedyotis | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Hedypnois | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hedysarum | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hedyscepe | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Hedythyrsus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Heeria | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Hegewardia | Chlorellales | Luo et al. (2009); Pröschold et al. (2010) | Chlorella clade in Chlorellaceae. | ICBN |
| Hegnera | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hegneria | Euglenamorphales | Leedale (1967); Leedale (2000) | . | ICBN |
| Heilogonemertes | Eumonostilifera | Chernyshev (2005); Kajihara et al. (2008) | Poseidonemertidae. | ICZN |
| Heimansia | Desmidiales | Gontcharov (2008) | . | ICBN |
| Heimia | Myrtales | Mabberley (2008) | Lythraceae. | ICBN |
| Heimiochrysis | Hibberdiales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chrysocapsaceae (no flagellate stage). | ICBN |
| Heimyscus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Heinrichia | Passeriformes | Clements (2007) | . | ICZN |
| Heinsenia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Heinsia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Heisteria | Santalales | Mabberley (2008) | Erythropalaceae. | ICBN |
| Hekistocarpa | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Heladena | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Helarctos | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Helaria | Actiniaria | Fautin et al. (2007) | Replacement name for Heliactis, but not currently considered valid. | ICZN |
| Helcia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Helcobacillus | Micrococcales | Renvoise et al. (2009); Ludwig et al. (2012) | . | ICNB |
| Helcococcus | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Heldreichia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Heleia | Passeriformes | Clements (2007) | . | ICZN |
| Heleioporus | Anura | Vitt & Caldwell (2009) | Limnodynastidae. | ICZN |
| Helellophrya | Astomatida | Lynn (2008) | . | ICZN |
| Helenina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Heleninidae. | ICZN |
| Helenium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heleopera | Arcellinida | Meisterfeld (2000) | Difflugina -- Heleoperidae. | ICZN |
| Heleophryne | Anura | Vitt & Caldwell (2009) | Heleophrynidae. | ICZN |
| Helgicirrha | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Helgoeca | Acanthoecida | Leadbeater et al. (2008) | . | ICZN |
| Helgolandinium | Gonyaulacales | Fensome et al. (1993) | . | ICBN |
| Heliactin | Apodiformes | Clements (2007) | . | ICZN |
| Heliactis | Actiniaria | Fautin et al. (2007) | Junior homonym. Replaced by Helaria. | ICZN |
| Heliamphora | Ericales | Mabberley (2008) | Sarraceniaceae. | ICBN |
| Heliangelus | Apodiformes | Clements (2007) | . | ICZN |
| Helianthella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Helianthemum | Malvales | Mabberley (2008) | Cistaceae. | ICBN |
| Helianthostylis | Rosales | Mabberley (2008) | Moraceae. | ICBN |
| Helianthus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heliapsis | Hibberdiales | Kristiansen & Preisig (2001) | Stylococcaceae. | ICBN |
| Helicanthes | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Helichrysopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Helichrysum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Helicia | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Heliciopsis | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Helicobacter | Campylobacterales | Garrity et al. (2005) | . | ICNB |
| Helicoblepharum | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Helicodiceros | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Helicodontium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Helicogorgia | Alcyonacea | Bayer (1981) | Chrysogorgiidae. | ICZN |
| Heliconia | Zingiberales | Mabberley (2008) | Heliconiaceae. | ICBN |
| Helicopedinella | Pedinellales | Sekiguchi et al. (2003) | . | ICBN |
| Helicophyllum | Helicophyllales | Stech & Frey (2008); Goffinet et al. (2009) | . | ICBN |
| Helicoprorodon | Haptorida | Lynn (2008) | . | ICZN |
| Helicops | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Helicosalpa | Salpida | Godeaux (1998) | . | ICZN |
| Helicosphaera | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007); Couapel et al. (2009) | Later synonym of Syracolithus. | ICBN |
| Helicosporidium | Chlorellales | Ueno et al. (2005) | As AHP lineage. | ICBN |
| Helicostoma | Philasterida | Lynn (2008) | . | ICZN |
| Helicostomella | Tintinnida | Lynn (2008) | . | ICZN |
| Helicostylis | Rosales | Mabberley (2008) | Moraceae. | ICBN |
| Helicozoster | Vestibuliferida | Lynn (2008) | . | ICZN |
| Helicteres | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Helicteropsis | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Helictonema | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Helictotrichon | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Helietta | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Helikotropis | Rhabdomonadales | Leedale (1967) | Probably later synonym of Gyropagne. | ICBN |
| Helinus | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Heliobacillus | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Heliobacterium | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Heliobletus | Passeriformes | Clements (2007) | . | ICZN |
| Heliobolus | Squamata | Vitt & Caldwell (2009) | Lacertidae. | ICZN |
| Heliocarpus | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Heliocauta | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heliochona | Exogemmida | Lynn (2008) | . | ICZN |
| Heliochrysis | Hibberdiales | Kristiansen & Preisig (2001) | Stylococcaceae. | ICBN |
| Heliodiscus | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Heliodoxa | Apodiformes | Clements (2007) | . | ICZN |
| Heliofungia | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Heliolithium | Symphyacanthida | Febvre et al. (2000) | . | ICZN |
| Heliomaster | Apodiformes | Clements (2007) | . | ICZN |
| Heliomeris | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heliomorpha | Heliomonadida | Bass et al. (2009); Yabuki et al. (2012) | . | ICZN |
| Heliopais | Gruiformes | Clements (2007) | . | ICZN |
| Heliopathes | Antipatharia | Opresko (2003); Opresko (2011) | Later homonym. Replaced by Heteropathes. | ICZN |
| Heliophila | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Heliophilum | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Heliophobius | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Heliophrya | Evaginogenida | Lynn (2008) | . | ICZN |
| Heliopora | Helioporacea | Bayer (1981) | . | ICZN |
| Heliopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heliorestis | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Heliornis | Gruiformes | Clements (2007) | . | ICZN |
| Heliosciurus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Helioseris | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Heliospora | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Heliothrix | Chloroflexales | Garrity et al. (2005) | . | ICNB |
| Heliothryx | Apodiformes | Clements (2007) | . | ICZN |
| Heliotropium | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Helixanthera | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Helkesimastix | | Cavalier-Smith et al. (2009) | Domain Eucarya - Phylum Cercozoa. Sainouroidea; Helkesimastigidae. | ICZN |
| Helladosphaera | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | former Calyptrosphaeraceae. | ICBN |
| Hellea | | Garrity et al. (2005); Williams et al. (2007); Alain et al. (2008) | Domain Bacteria - Phylum Proteobacteria - Class Alphaproteobacteria. Hyphomonadaceae. | ICNB |
| Helleborus | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Hellenocarum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Helleriella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hellmayrea | Passeriformes | Clements (2007) | . | ICZN |
| Hellmuthia | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Helmholtzia | Commelinales | Mabberley (2008) | Philydraceae. | ICBN |
| Helmichia | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Helminthocladia | Nemaliales | Schneider & Wynne (2007) | . | ICBN |
| Helminthogloea | Heterogloeales | Ettl (1978) | . | ICBN |
| Helminthophis | Squamata | Vitt & Caldwell (2009) | Serpentes. Anomalepididae. | ICZN |
| Helminthora | Nemaliales | Schneider & Wynne (2007) | . | ICBN |
| Helminthostachys | Ophioglossales | Christenhusz et al. (2011) | . | ICBN |
| Helminthotheca | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Helmiopsiella | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Helmiopsis | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Helmitheros | Passeriformes | Clements (2007) | . | ICZN |
| Helmontia | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Heloderma | Squamata | Vitt & Caldwell (2009) | Helodermatidae. | ICZN |
| Helodium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Helogale | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Helogyne | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Helonias | Liliales | Mabberley (2008) | Melanthiaceae. | ICBN |
| Heloniopsis | Liliales | Mabberley (2008) | Melanthiaceae. | ICBN |
| Helonoma | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Helophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Helophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Helosis | Santalales | Mabberley (2008) | Balanophoraceae. | ICBN |
| Helwingia | Aquifoliales | Mabberley (2008) | Helwingiaceae. | ICBN |
| Hemachatus | Squamata | Vitt & Caldwell (2009) | Serpentes. Elapidae. | ICZN |
| Hemandradenia | Oxalidales | Mabberley (2008) | Connaraceae. | ICBN |
| Hemarthria | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hematodinium | Syndinida | Fensome et al. (1993) | . | ICZN |
| Hemerocallis | Asparagales | Mabberley (2008) | Hemerocallidaceae. | ICBN |
| Hemiamphisiella | Stichotrichida | Lynn (2008) | . | ICZN |
| Hemiandra | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Hemianthus | Lamiales | Mabberley (2008) | Linderniaceae. | ICBN |
| Hemiarrhena | Lamiales | Mabberley (2008) | Linderniaceae. | ICBN |
| Hemiaspis | Squamata | Vitt & Caldwell (2009) | Serpentes. Elapidae. | ICZN |
| Hemiasterella | Hadromerida | Hooper (2002) | . | ICZN |
| Hemibelideus | Diprotodontia | Groves (2005) | . | ICZN |
| Hemiboea | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Hemiboeopsis | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Hemibungarus | Squamata | Vitt & Caldwell (2009) | Serpentes. Elapidae. | ICZN |
| Hemicentetes | Afrosoricida | McKenna & Bell (1997); Stanhope et al. (1998) | Tenrecidae. | ICZN |
| Hemichaena | Lamiales | Mabberley (2008) | Phrymaceae. | ICBN |
| Hemichroa | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Hemicircus | Piciformes | Clements (2007) | . | ICZN |
| Hemicrambe | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Hemicycliostyla | Urostylida | Lynn (2008) | . | ICZN |
| Hemidactylium | Caudata | Vitt & Caldwell (2009) | Plethodontidae. | ICZN |
| Hemidactylus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Hemidasys | Macrodasyida | Hummon & Todaro (2010) | . | ICZN |
| Hemidesmus | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Hemidictyum | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Hemidinium | Phytodiniales | Fensome et al. (1993) | . | ICBN |
| Hemidiscella | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ammodiscidae. | ICZN |
| Hemiechinus | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Hemiergis | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Hemigaleus | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Hemigalus | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Hemigastrostyla | Sporadotrichida | Lynn (2008) | . | ICZN |
| Hemigellius | Haplosclerida | Desqueyroux-Faúndez & Valentine (2002) | . | ICZN |
| Hemigenia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Hemignathus | Passeriformes | Clements (2007) | . | ICZN |
| Hemiholosticha | Stichotrichida | Lynn (2008) | . | ICZN |
| Hemilophia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Hemimacronyx | Passeriformes | Clements (2007) | . | ICZN |
| Hemimastix | Hemimastigida | Cavalier-Smith (1993) | . | ICZN |
| Hemimeris | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Hemimycale | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Hemineura | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Heminotus | Pleurostomatida | Lynn (2008) | . | ICZN |
| Hemionitis | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Hemiorchis | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Hemiphaga | Columbiformes | Clements (2007) | . | ICZN |
| Hemiphora | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Hemiphractus | Anura | Vitt & Caldwell (2009) | Hemiphractidae. | ICZN |
| Hemiphragma | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Hemiphylacus | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Hemiphyllodactylus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Hemipilia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hemipiliopsis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hemipogon | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Hemipristis | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Hemiprocne | Apodiformes | Clements (2007) | . | ICZN |
| Hemiprorodon | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Hemiptelea | Rosales | Mabberley (2008) | Ulmaceae. | ICBN |
| Hemipus | Passeriformes | Clements (2007) | . | ICZN |
| Hemiragis | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Hemirhagerrhis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Hemirobulina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Vaginulinidae. | ICZN |
| Hemiscolopia | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Hemiscyllium | Orectolobiformes | Nelson (2006) | . | ICZN |
| Hemiselmis | Pyrenomonadales | Clay et al. (1999); Novarino (2003) | . | ICBN |
| Hemisincirra | Sporadotrichida | Lynn (2008) | . | ICZN |
| Hemisorghum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hemispadella | Phragmophora | Casanova (1996) | Spadellidae. | ICZN |
| Hemispeira | Thigmotrichida | Lynn (2008) | . | ICZN |
| Hemisphaerammina | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hemisphaeramminidae. | ICZN |
| Hemisphaerella | Mischococcales | Ettl (1978) | . | ICBN |
| Hemisphaeriodon | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Hemispingus | Passeriformes | Clements (2007) | . | ICZN |
| Hemistasia | | Adl et al. (2005) | Domain Eucarya - Phylum Euglenozoa - Class Kinetoplastea. | ICZN |
| Hemistepta | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hemistyela | Stolidobranchia | Monniot & Monniot (1972) | Styelidae. | ICZN |
| Hemistylus | Rosales | Mabberley (2008) | Urticaceae. | ICBN |
| Hemisus | Anura | Vitt & Caldwell (2009) | Hemisotidae. | ICZN |
| Hemitedania | Poecilosclerida | Van Soest & Hajdu (2002) | . | ICZN |
| Hemitesia | Passeriformes | Clements (2007) | . | ICZN |
| Hemitheca | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Hemitheconyx | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Hemithraupis | Passeriformes | Clements (2007) | . | ICZN |
| Hemithrinax | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Hemitomes | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Hemitragus | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Hemitriakis | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Hemitriccus | Passeriformes | Clements (2007) | . | ICZN |
| Hemitrichia | Trichiales | Yamamoto (1998); Lado (2001); Lado et al. (2005) | . | ICBN |
| Hemitrichodina | Mobilida | Lynn (2008) | . | ICZN |
| Hemiurosoma | Sporadotrichida | Lynn (2008) | . | ICZN |
| Hemixos | Passeriformes | Clements (2007) | . | ICZN |
| Hemizonella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hemizonia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hemolivia | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Hemsleya | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Henckelia | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Henicodium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Henicopernis | Falconiformes | Clements (2007) | . | ICZN |
| Henicophaps | Columbiformes | Clements (2007) | . | ICZN |
| Henicorhina | Passeriformes | Clements (2007) | . | ICZN |
| Henleophytum | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Hennecartia | Laurales | Mabberley (2008) | Monimiaceae. | ICBN |
| Hennediella | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Hennedya | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Hennegoides | Bivalvulida | Lom & Dyková (2006) | . | ICZN |
| Henneguya | Bivalvulida | Lom & Dyková (2006) | . | ICZN |
| Henoceros | Bdelloida | Segers (2002); Segers (2007) | . | ICZN |
| Henonia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Henoonia | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Henophyton | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Henrardia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Henriciella | | Williams et al. (2007); Quan et al. (2009) | Domain Bacteria - Phylum Proteobacteria - Class Alphaproteobacteria. Hyphomonadaceae. | ICNB |
| Henricksonia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Henriettea | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Henriquezia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Henrya | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Hensenanthula | Ceriantharia | Tiffon (1987) | . | ICZN |
| Hensmania | Asparagales | Mabberley (2008) | Hemerocallidaceae. | ICBN |
| Hentschelia | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Heosemys | Testudinata | Vitt & Caldwell (2009) | Geomydidae. | ICZN |
| Hepatocystis | Haemospororida | Perkins et al. (2000) | . | ICZN |
| Hepatostolonophora | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Hepatozoon | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Heppiella | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Heptacodium | Dipsacales | Mabberley (2008) | Caprifoliaceae. | ICBN |
| Heptamegacanthus | Oligacanthorhynchida | Spencer Jones (1990) | Oligacanthorhynchidae. | ICZN |
| Heptanthus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heptaptera | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Heptranchias | Hexanchiformes | Nelson (2006) | . | ICZN |
| Heracleum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Herbaspirillum | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Herbertia | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Herbertus | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Herbiconiux | Micrococcales | Behrendt et al. (2011); Ludwig et al. (2012) | Microbacteriaceae. | ICNB |
| Herbidospora | Streptosporangiales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Herbstia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Herderia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Herdmania | Gymnodiniales | Fensome et al. (1993) | . | ICBN |
| Herdmania | Stolidobranchia | Monniot (2001) | Pyuridae. | ICZN |
| Herengeria | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids) Corallistidae. | ICZN |
| Hereroa | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Heringia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Herissantia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Heritiera | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Hermannia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Hermas | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Hermbstaedtia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Hermesinum | Ebriida | Patterson et al. (2000) | . | ICZN |
| Herminiimonas | Burkholderiales | Fernandes et al. (2005) | . | ICNB |
| Herminium | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hernandia | Laurales | Mabberley (2008) | Hernandiaceae. | ICBN |
| Herniaria | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Herodotia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heronallenia | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Heronalleniidae. | ICZN |
| Heronallenita | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Glabratellidae. | ICZN |
| Herpele | Gymnophiona | Vitt & Caldwell (2009) | "Caeciliidae". | ICZN |
| Herpestes | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Herpetacanthus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Herpetineuron | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Herpetomonas | Trypanosomatida | Moreira et al. (2004) | . | ICZN |
| Herpetophrya | Astomatida | Lynn (2008) | . | ICZN |
| Herpetosiphon | Herpetosiphonales | Garrity et al. (2005) | . | ICNB |
| Herpetospermum | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Herpetotheres | Falconiformes | Clements (2007) | . | ICZN |
| Herpinella | Astomatida | Lynn (2008) | . | ICZN |
| Herpochondria | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Herpolirion | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Herpolitha | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Herpophyllum | | Schneider & Wynne (2007) | . | ICBN |
| Herpopteros | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Herposiphonia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Herposiphoniella | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Herpsilochmus | Passeriformes | Clements (2007) | . | ICZN |
| Herpysma | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Herpyza | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Herpyzonema | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Herrania | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Herreranthus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Herreria | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Herreriopsis | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Herrickia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hertia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hertwigia | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Herzogianthus | Ptilidiales | Crandall-Stotler et al. (2009) | . | ICBN |
| Herzogiaria | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Herzogiella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Herzogobryum | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Hesiolicium | Acoela | Crezée & Tyler (1976) | . | ICZN |
| Hespellia | Clostridiales | Whitehead et al. (2004) | . | ICNB |
| Hesperalbizia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hesperaloe | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Hesperantha | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Hesperelaea | Lamiales | Mabberley (2008) | Oleaceae. | ICBN |
| Hesperevax | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hesperidanthus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Hesperis | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Hesperocallis | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Hesperochiron | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Hesperocnide | Rosales | Mabberley (2008) | Urticaceae. | ICBN |
| Hesperocyparis | Cupressales | Adams et al. (2009); Christenhusz et al. (2011) | Christenhusz et al. (2011) treated Hesperocyparis as a later synonym of Cupressus. | ICBN |
| Hesperolaburnum | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hesperomannia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hesperomecon | Ranunculales | Mabberley (2008) | Papaveraceae. | ICBN |
| Hesperomeles | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Hesperopeuce | Pinales | Farjon (2001); Mabberley (2008); Eckenwalder (2009); Christenhusz et al. (2011) | Later synonym of Tsuga. | ICBN |
| Hesperoptenus | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Hesperostipa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hesperothamnus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hesperoxiphion | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Hesperoyucca | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Hesperozygis | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Hessea | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Hessea | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Hetaeria | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Heteracanthocephalus | Echinorhynchida | Amin (1985) | . | ICZN |
| Heterachne | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Heteracia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heteracon | Chaunacanthida | Febvre et al. (2000) | . | ICZN |
| Heteractis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Heteradelphia | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Heteramoeba | Schizopyrenida | Patterson et al. (2000) | . | ICZN |
| Heteranthelium | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Heteranthemis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heteranthera | Commelinales | Mabberley (2008) | Pontederiaceae. | ICBN |
| Heteranthia | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Heteranthoecia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Heteranthus | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Heteraulacus | | Fensome et al. (1993) | Domain Eucarya - Phylum Dinozoa - Class Dinophyceae - Subclass Peridiniphycidae. | ICBN |
| Heterixalus | Anura | Vitt & Caldwell (2009) | Hyperoliidae. | ICZN |
| Heterobractum | Peridiniales | Carbonell-Moore (1994) | . | ICBN |
| Heterocapsa | Peridiniales | Fensome et al. (1993) | . | ICBN |
| Heterocassidulina | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cassidulinidae. | ICZN |
| Heterocentron | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Heterocephalus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Heterocercus | Passeriformes | Clements (2007) | . | ICZN |
| Heterochaenia | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Heterochaerus | Acoela | Hooge (2003); Hooge & Tyler (2005) | . | ICZN |
| Heterochlorella | | Neustupa et al. (2009) | Domain Eucarya - Phylum Chlorophyta - Class Trebouxiophyceae. Watanabea-clade. | ICBN |
| Heterochloris | Chloramoebales | Ettl (1978) | . | ICBN |
| Heterochona | Exogemmida | Lynn (2008) | . | ICZN |
| Heterochone | Hexactinosida | Reiswig (2002) | . | ICZN |
| Heterocinetopsis | Rhynchodida | Lynn (2008) | . | ICZN |
| Heterocladia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Heterocladium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Heterococcus | Tribonematales | Ettl (1978) | . | ICBN |
| Heterocodon | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Heterocoma | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heterocondylus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heterocoryne | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Heterocyanococcus | Nostocales | Yamagishi (2007) | . | ICBN |
| Heterocyathus | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Heterocyclina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Nummulitidae. | ICZN |
| Heterocypsela | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heterodactyla | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Heterodactylus | Squamata | Vitt & Caldwell (2009) | Gymnophthalmidae. | ICZN |
| Heterodasya | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Heterodendron | Tribonematales | Ettl (1978); Silva (1979) | Later homonym, but probably no substitute name has been published. | ICBN |
| Heteroderis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heterodesmus | Mischococcales | Ettl (1978) | . | ICBN |
| Heterodinium | Gonyaulacales | Fensome et al. (1993) | . | ICBN |
| Heterodiophrys | Euplotida | Jiang & Song (2010) | . | ICZN |
| Heterodon | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Heterodontus | Heterodontiformes | Nelson (2006) | . | ICZN |
| Heterodoxia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Heteroenopleus | Heteronemertea | Kajihara et al. (2008) | . | ICZN |
| Heteroflorum | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Heterogloea | Heterogloeales | Ettl (1978) | . | ICBN |
| Heteroglossum | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Heteroglypha | Euglyphida | Meisterfeld (2000) | . | ICZN |
| Heterogorgia | Alcyonacea | Bayer (1981) | Plexauridae. | ICZN |
| Heterogromia | | Bass et al. (2009) | Domain Eucarya - Phylum Cercozoa - Class Granofilosea. | ICZN |
| Heterogromia | Allogromiida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Lagynidae. | ICZN |
| Heterohyrax | Hyracoidea | McKenna & Bell (1997) | . | ICZN |
| Heterokrohnia | Phragmophora | Casanova (1985); Bieri (1991) | Heterokrohniidae. Now checking. | ICZN |
| Heterolagynion | Hibberdiales | Kristiansen & Preisig (2001) | Stylococcaceae. | ICBN |
| Heterolamium | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Heteroleibleinia | Pseudanabaenales | Hoffmann et al. (2005) | . | ICBN |
| Heterolepa | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Heterolepidae. | ICZN |
| Heterolepidoderma | Chaetonotida | Balsamo et al. (2009); Hummon & Todaro (2010) | . | ICZN |
| Heterolepis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heteroliodon | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Heteromeles | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Heteromera | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heteromeyenia | Haplosclerida | Manconi & Pronzato (2002) | . | ICZN |
| Heteromirafra | Passeriformes | Clements (2007) | . | ICZN |
| Heteromma | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heteromorpha | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Heteromorphina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ellipsolagenidae. | ICZN |
| Heteromunia | Passeriformes | Clements (2007) | . | ICZN |
| Heteromyias | Passeriformes | Clements (2007) | . | ICZN |
| Heteromys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Heteronarce | Torpediniformes | Nelson (2006) | . | ICZN |
| Heteronema | Heteronematales | Leedale (1967); Leedale (2000) | . | ICBN |
| Heteronemertes | Heteronemertea | Kajihara et al. (2008) | . | ICZN |
| Heteronetta | Anseriformes | Clements (2007) | . | ICZN |
| Heteronotia | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Heterooxytricha | Sporadotrichida | Shao et al. (2011) | . | ICZN |
| Heteropanax | Apiales | Mabberley (2008) | Araliaceae. | ICBN |
| Heteropatellina | Spirillinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Patellinidae. | ICZN |
| Heteropathes | Antipatharia | Opresko (2003); Opresko (2011) | Replacement name for Heliopathes. | ICZN |
| Heteropedia | Tribonematales | Ettl (1978) | . | ICBN |
| Heteroperipatus | Euonychophora | Peck (1975) | Peripatidae. | ICZN |
| Heterophasia | Passeriformes | Clements (2007) | . | ICZN |
| Heteropholis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Heterophragma | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Heterophrys | Pterocystida | Mikrjukov et al. (2000); Cavalier-Smith & von der Heyden (2007); Yabuki et al. (2012) | Heterophryidae. | ICZN |
| Heterophyllaea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Heterophyllium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Heteropia | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Heteroplexis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heteropogon | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Heteropolaria | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Heteropolygonatum | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Heteropsammia | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Heteropsis | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Heteropterys | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Heteroptilon | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Heteropyramis | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Heteropyxis | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Heteroraphidiophrys | Acanthocystida | Cavalier-Smith & von der Heyden (2007); Yabuki et al. (2012) | Raphidiophryidae. | ICZN |
| Heterorete | Hexactinosida | Reiswig & Wheeler (2002) | . | ICZN |
| Heterorhachis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heterorotula | Haplosclerida | Manconi & Pronzato (2002) | . | ICZN |
| Heteroschisma | Dinophysiales | Fensome et al. (1993) | . | ICBN |
| Heteroscyllium | Orectolobiformes | Nelson (2006) | . | ICZN |
| Heteroscymnoides | Squaliformes | Nelson (2006) | . | ICZN |
| Heteroscyphus | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Heterosentis | Echinorhynchida | Amin (1985) | . | ICZN |
| Heterosigma | Raphidomonadales | Heywood & Leedale (2000) | . | ICBN |
| Heterosiphonia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Heterosmilax | Liliales | Mabberley (2008) | Smilacaceae. | ICBN |
| Heterospathe | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Heterosperma | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heterospingus | Passeriformes | Clements (2007) | . | ICZN |
| Heterospora | Archigregarinorida | Perkins et al. (2000); Rueckert & Leander (2009) | Selenidiidae. | ICZN |
| Heterosporis | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Heterostachys | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Heterostegina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Nummulitidae. | ICZN |
| Heterostemma | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Heterostemon | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Heterostentor | Heterotrichida | Lynn (2008) | . | ICZN |
| Heterostigma | Stolidobranchia | Monniot & Monniot (1972); Monniot (2001) | Pyuridae. | ICZN |
| Heterostroma | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Heterotella | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Heterothalamus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heterothamnion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Heterotheca | Allogromiida | Kaminski (2000) | Lagynidae. | ICZN |
| Heterotheca | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Heterothrix | Tribonematales | Ettl (1978); Silva (1979) | Later homonym. Replaced by "Xanthonema". | ICBN |
| Heterotiara | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Heterotoma | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Heterotrichella | Tribonematales | Ettl (1978) | . | ICBN |
| Heterotrichum | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Heterovesicula | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Heteroxenia | Alcyonacea | Bayer (1981) | Xeniidae. | ICZN |
| Heteroxenotrichula | Chaetonotida | Balsamo et al. (2009); Hummon & Todaro (2010) | . | ICZN |
| Heteroxya | Halichondrida | Hooper (2002) | . | ICZN |
| Heuchera | Saxifragales | Mabberley (2008) | Saxifragaceae. | ICBN |
| Heucherella | Saxifragales | Mabberley (2008) | xHeucherella. Heuchera x Tiarella hybrids. Saxifragaceae. | ICBN |
| Heurnia | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Hevea | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Heveochlorella | | Neustupa et al. (2009); Darienko et al. (2010) | Domain Eucarya - Phylum Chlorophyta - Class Trebouxiophyceae. Watanabea-clade. | ICBN |
| Hewittia | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Hexacapsula | Multivalvulida | Lom & Dyková (2006) | . | ICZN |
| Hexacontium | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Hexaconus | Arthracanthida | Febvre et al. (2000) | . | ICZN |
| Hexacrobylus | Aspiraculata | Monniot & Monniot (1972); Kott (1989); Monniot & Monniot (1990); Kott (1998) | Junior synonym of Oligotrema. | ICZN |
| Hexactinella | Hexactinosida | Reiswig (2002) | . | ICZN |
| Hexacyrtis | Liliales | Mabberley (2008) | Colchicaceae. | ICBN |
| Hexadactylus | Aspiraculata | Monniot & Monniot (1990); Kott (1998); Monniot (2001) | Junior synonym of Asajirus. | ICZN |
| Hexadella | Verongida | Bergquist & Cook (2002) | . | ICZN |
| Hexaglandula | Polymorphida | Amin (1985); Amin (1992); García-Varela & Pérez-Ponce de León (2008) | . | ICZN |
| Hexalaspis | Arthracanthida | Febvre et al. (2000) | . | ICZN |
| Hexalectris | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hexalobus | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Hexalonche | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Hexamastix | Honigbergiellida | Cepicka et al. (2010) | . | ICZN |
| Hexamita | Diplomonadida | Brugerolle & Lee (2000) | . | ICZN |
| Hexanchus | Hexanchiformes | Nelson (2006) | . | ICZN |
| Hexapathes | Antipatharia | Opresko (2003) | . | ICZN |
| Hexapodibius | Parachela | Kinchin (1994) | . | ICZN |
| Hexaprotodon | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Hexapterella | Dioscoreales | Mabberley (2008) | Burmanniaceae. | ICBN |
| Hexapyle | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Hexarthra | Flosculariaceae | Segers (2002); Segers (2007) | . | ICZN |
| Hexaspiron | Neoechinorhynchida | Amin (1985) | . | ICZN |
| Hexaspora | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Hexatheca | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Hexatrygon | Myliobatiformes | Nelson (2006) | . | ICZN |
| Hexotricha | Microthoracida | Lynn (2008) | . | ICZN |
| Heydrichia | Sporolithales | Schneider & Wynne (2007); Le Gall et al. (2010) | . | ICBN |
| Heynea | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Heynella | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Heynigia | Chlorellales | Bock et al. (2010) | Chlorella clade in Chlorellaceae. | ICBN |
| Heywoodia | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Hibberdia | Hibberdiales | Kristiansen & Preisig (2001) | Hibberdiaceae. | ICBN |
| Hibbertia | Dilleniales | Mabberley (2008) | Dilleniaceae. | ICBN |
| Hibiscadelphus | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Hibiscus | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Hicanonectes | | Park et al. (2009) | Domain Eucarya - Phylum Metamonada - Subphylum Trichozoa (Fornicata). Closely related to Carpediemonas. | ICZN |
| Hickelia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hicksbeachia | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Hicksonella | Alcyonacea | Bayer (1981) | Gorgoniidae. | ICZN |
| Hidalgoa | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hideophyllum | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Hieracium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hieremys | Testudinata | Vitt & Caldwell (2009) | Geomydidae. | ICZN |
| Hieris | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Hiernia | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Hierobotana | Lamiales | Mabberley (2008) | Verbenaceae. | ICBN |
| Hieronyma | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Hieronymiella | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Hierophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Higginsia | Halichondrida | Hooper (2002) | . | ICZN |
| Hilaria | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hildebrandtia | Anura | Vitt & Caldwell (2009) | Ptychadenidae. | ICZN |
| Hildebrandtia | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Hildebrandtiella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Hildegardia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Hildemannia | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Epistomariidae. | ICZN |
| Hildenbrandia | Hildenbrandiales | Schneider & Wynne (2007) | . | ICBN |
| Hillea | | Novarino (2003) | Domain Eucarya - Kingdom Cryptobiontes - Phylum Cryptophyta ?. | ICBN |
| Hillebrandia | Cucurbitales | Mabberley (2008) | Begoniaceae. | ICBN |
| Hilleria | Caryophyllales | Mabberley (2008) | Phytolaccaceae. | ICBN |
| Hillia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Hilliardia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hilpertia | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Hilsenbergia | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Himalaiella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Himalayacalamus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Himalrandia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Himantocladium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Himantoglossum | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Himantopus | Charadriiformes | Clements (2007) | . | ICZN |
| Himantornis | Gruiformes | Clements (2007) | . | ICZN |
| Himantura | Myliobatiformes | Nelson (2006) | . | ICZN |
| Himatanthus | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Himatione | Passeriformes | Clements (2007) | . | ICZN |
| Hincksella | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Hindakia | Chlorellales | Bock et al. (2010) | Chlorella clade in Chlorellaceae. | ICBN |
| Hindsia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Hinterhubera | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hintonella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hintonia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Hinumanemertes | Heteronemertea | Gibson (1995) | . | ICZN |
| Hionanthera | Myrtales | Mabberley (2008) | Lythraceae. | ICBN |
| Hippea | Desulfurellales | Garrity et al. (2005) | . | ICNB |
| Hippeastrum | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Hippeophyllum | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hippia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hippobroma | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Hippobromus | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Hippocamelus | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Hippocomos | Pleuronematida | Lynn (2008) | . | ICZN |
| Hippocratea | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Hippocrepina | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hippocrepinidae. | ICZN |
| Hippocrepinella | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hippocrepinellidae. | ICZN |
| Hippocrepis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hippolais | Passeriformes | Clements (2007) | . | ICZN |
| Hippolytia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hippomane | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Hippophae | Rosales | Mabberley (2008) | Elaeagnaceae. | ICBN |
| Hippopodius | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Hippopotamus | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Hipposideros | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Hippospongia | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Hippotis | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Hippotragus | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Hippurella | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Hippuris | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Hiptage | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Hiraea | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Hirmocystis | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Hirpicium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hirschia | | Garrity et al. (2005); Williams et al. (2007) | Domain Bacteria - Phylum Proteobacteria - Class Alphaproteobacteria. Hyphomonadaceae. | ICNB |
| Hirsutithallia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Hirsutosporos | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Hirtella | Malpighiales | Mabberley (2008) | Chrysobalanaceae. | ICBN |
| Hirtellina | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hirtzia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hirundapus | Apodiformes | Clements (2007) | . | ICZN |
| Hirundinea | Passeriformes | Clements (2007) | . | ICZN |
| Hirundo | Passeriformes | Clements (2007) | . | ICZN |
| Hispidella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hispidopetra | Agelasida | Vacelet (2002) | . | ICZN |
| Histiobalantium | Pleuronematida | Lynn (2008) | . | ICZN |
| Histiona | Jakobida | Patterson et al. (2000) | . | ICZN |
| Histioneis | Dinophysiales | Fensome et al. (1993) | . | ICBN |
| Histiophysis | Dinophysiales | Fensome et al. (1993) | . | ICBN |
| Histiopteris | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Histiotus | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Histodermella | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Histomonas | Tritrichomonadida | Cepicka et al. (2010) | . | ICZN |
| Histophilus | Pasteurellales | Angen et al. (2003) | . | ICNB |
| Histriculus | Sporadotrichida | Lynn (2008) | . | ICZN |
| Histrionicus | Anseriformes | Clements (2007) | . | ICZN |
| Histriophoca | Carnivora | Wozencraft (2005) | . | ICZN |
| Histurgops | Passeriformes | Clements (2007) | . | ICZN |
| Hitchcockella | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hitchenia | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Hladnikia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Hoarella | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Hochreutinera | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Hockinia | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Hodgkinsonia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Hodgsonia | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Hodgsoniola | Asparagales | Mabberley (2008) | Hemerocallidaceae. | ICBN |
| Hodgsonius | Passeriformes | Clements (2007) | . | ICZN |
| Hodomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Hoeflea | Rhizobiales | Peix et al. (2005) | . | ICNB |
| Hoeglundina | Robertinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Epistominidae. | ICZN |
| Hoehnea | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Hoehneella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hoehnephytum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hoferellus | Bivalvulida | Lom & Dyková (2006) | . | ICZN |
| Hoffmannia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Hoffmanniella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hoffmannseggia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hofmeisterella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hofmeisteria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hofstenia | Acoela | Dörjes (1968) | . | ICZN |
| Hofsteniola | Acoela | Dörjes (1968); Faubel & Noreña (2001) | . | ICZN |
| Hohenackeria | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Hohenbergia | Poales | Mabberley (2008) | Bromeliaceae. | ICBN |
| Hohenbergiopsis | Poales | Mabberley (2008) | Bromeliaceae. | ICBN |
| Hoheria | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Hoita | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Holandrea | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Holarrhena | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Holascus | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Holaspis | Squamata | Vitt & Caldwell (2009) | Lacertidae. | ICZN |
| Holboellia | Ranunculales | Mabberley (2008) | Lardizabalaceae. | ICBN |
| Holbrookia | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Holcoglossum | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Holcolemma | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Holcotrochus | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Holcus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Holdemania | Erysipelotrichales | Garrity et al. (2005); Ludwig et al. (2009) | . | ICNB |
| Holigarna | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Hollandaea | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Hollandeia | Prokinetoplastida | Moreira et al. (2004); Özdikmen (2009) | Substitution name for Perkinsiella. | ICZN |
| Hollandina | Spirochaetales | Garrity et al. (2005) | . | ICNB |
| Hollenbergia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Hollermayera | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Hollisteria | Caryophyllales | Mabberley (2008) | Polygonaceae. | ICBN |
| Holmbergia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Holmesia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Holmgrenanthe | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Holmgrenia | Myrtales | Mabberley (2008) | Onagraceae. | ICBN |
| Holmsella | Gracilariales | Schneider & Wynne (2007) | . | ICBN |
| Holmskioldia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Holoaden | Anura | Vitt & Caldwell (2009) | Brachycephalidae. | ICZN |
| Holobispora | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Holocalyx | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Holocarpha | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Holocheila | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Holocheilus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Holochilus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Holochlamys | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Holococcolihophora | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | former Calyptrosphaeraceae. | ICBN |
| Holocoma | Rhynchodida | Lynn (2008) | . | ICZN |
| Holodactylus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Holodiscus | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Holodontium | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Hologerrhum | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Holographis | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Holohalaelurus | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Hololachna | Caryophyllales | Mabberley (2008) | Tamaricaceae. | ICBN |
| Hololeion | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Holomastigotes | Spirotrichonymphida | Cepicka et al. (2010) | . | ICZN |
| Holomastigotoides | Spirotrichonymphida | Cepicka et al. (2010) | . | ICZN |
| Holomitriopsis | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Holomitrium | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Holophaga | Holophagales | Garrity et al. (2005); Fukunaga et al. (2008) | . | ICNB |
| Holophrya | Prorodontida | Lynn (2008) | . | ICZN |
| Holophryoides | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Holophryozoon | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Holopsamma | Poecilosclerida | Hooper (2002) | . | ICZN |
| Holoptelea | Rosales | Mabberley (2008) | Ulmaceae. | ICBN |
| Holoregmia | Lamiales | Mabberley (2008) | Martyniaceae. | ICBN |
| Holoschkuhria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Holospora | Rickettsiales | Garrity et al. (2005) | . | ICNB |
| Holostemma | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Holosteum | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Holosticha | Urostylida | Lynn (2008) | . | ICZN |
| Holostichides | Urostylida | Lynn (2008) | . | ICZN |
| Holostylis | Piperales | Mabberley (2008) | Aristolochiaceae. | ICBN |
| Holothrix | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Holotrichia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Holoxea | Astrophorida | Uriz (2002) | . | ICZN |
| Holozonia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Holstianthus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Holttumochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Holubia | Lamiales | Mabberley (2008) | Pedaliaceae. | ICBN |
| Holzneria | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Homalanthus | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Homalia | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Homaliadelphus | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Homaliodendron | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Homalium | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Homalocalyx | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Homalocarpus | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Homalogastra | Philasterida | Lynn (2008) | . | ICZN |
| Homalohedra | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ellipsolagenidae. | ICZN |
| Homalomena | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Homalopetalum | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Homalopsis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Homalosciadium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Homalosorus | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Homalospermum | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Homalotheciella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Homalothecium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Homalozoon | Haptorida | Lynn (2008) | . | ICZN |
| Homaxinella | Hadromerida | Van Soest (2002) | . | ICZN |
| Hommersandia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Hommersandiella | Ceramiales | Wynne & Schneider (2010) | . | ICBN |
| Homo | Primates | McKenna & Bell (1997) | . | ICZN |
| Homoeodistoma | Aplousobranchia | Monniot & Monniot (1972) | Polyclinidae. | ICZN |
| Homoeonema | Trachymedusae | Bouillon et al. (2006) | . | ICZN |
| Homoeoptyche | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Homoeothrix | Nostocales | Yamagishi (2007) | . | ICBN |
| Homogammina | Psamminida | Gooday & Tendal (2000) | . | ICZN |
| Homognaphalium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Homogyne | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Homolepis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Homollea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Homolliella | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Homomallium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Homonoia | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Homonota | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Homopholis | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Homopholis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Homophymia | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids) Neopeltidae. | ICZN |
| Homophyton | Alcyonacea | Bayer (1981) | Anthothelidae. | ICZN |
| Homopus | Testudinata | Vitt & Caldwell (2009) | Testudinidae. | ICZN |
| Homoranthus | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Homoroselaps | Squamata | Vitt & Caldwell (2009) | Serpentes. Atractaspididae. | ICZN |
| Homoroselaps | Squamata | Vitt & Caldwell (2009) | Serpentes. Elapidae. | ICZN |
| Homoserinimonas | Micrococcales | Kim et al. (2012) | . | ICNB |
| Homotrema | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Homotrematidae. | ICZN |
| Homozeugos | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Homozygosphaera | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | former Calyptrosphaeraceae. | ICBN |
| Honckenya | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Hondaella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Hongia | Propionibacteriales | Garrity et al. (2005); Evtushenko & Ariskina (2012) | Later synonym of Kribbella. | ICNB |
| Hongiella | Sphingobacteriales | Yi & Chun (2004); Nedashkovskaya et al. (2007) | Later synonym of Algoriphaga. | ICNB |
| Honigbergiella | Honigbergiellida | Cepicka et al. (2010) | . | ICZN |
| Hoodia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Hoodiopsis | Gentianales | Mabberley (2008) | xHoodiopsis. Hoodia x Stapelia hybrids. Apocynaceae. | ICBN |
| Hoogenraadia | Arcellinida | Meisterfeld (2000) | Difflugina -- Plagiopyxidae. | ICZN |
| Hooglandia | Oxalidales | Mabberley (2008) | Cunoniaceae. | ICBN |
| Hookeria | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Hookeriopsis | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Hopea | Malvales | Mabberley (2008) | Dipterocarpaceae. | ICBN |
| Hopia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hopkinsia | Poales | Mabberley (2008) | Anarthriaceae. | ICBN |
| Hopkinsina | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Stainforthiidae. | ICZN |
| Hopkinsinella | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Siphogenerinoididae. | ICZN |
| Hoplangia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Hoplestigma | Boraginales | Mabberley (2008) | Hoplestigmataceae. | ICBN |
| Hoplitophrya | Astomatida | Lynn (2008) | . | ICZN |
| Hoplobatrachus | Anura | Vitt & Caldwell (2009) | Dicroglossidae. | ICZN |
| Hoplocephalus | Squamata | Vitt & Caldwell (2009) | Serpentes. Elapidae. | ICZN |
| Hoplocercus | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Hoplodactylus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Hoplomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Hoplonympha | Trichonymphida | Cepicka et al. (2010) | . | ICZN |
| Hoplophryne | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Hoplophyllum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hoplorhynchus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Hoppea | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Horaella | Flosculariaceae | Segers (2002); Segers (2007) | . | ICZN |
| Horaninovia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Horastrea | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Hordelymus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hordeum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Horichia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Horikawaea | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Horikawaella | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Horizorhinus | Passeriformes | Clements (2007) | . | ICZN |
| Hormathia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Hormathianthus | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Hormathonema | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Hormathophylla | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Hormidiella | Klebsormidiales | Mikhailyuk et al. (2008) | . | ICBN |
| Horminum | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Hormiphora | Cydippida | Harbison & Madin (1982) | . | ICZN |
| Hormonotus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Hormophora | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Hormoscilla | Oscillatoriales | Hoffmann et al. (2005) | . | ICBN |
| Hormosina | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hormosinidae. | ICZN |
| Hormosinella | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hormosinidae. | ICZN |
| Hormosinelloides | Lituolida | Kaminski (2008) | Reophacinae. | ICZN |
| Hormosinoides | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hormosinidae. | ICZN |
| Hormosoma | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Hormothamnion | Nostocales | Greuter et al. (1993) | . | ICBN |
| Hormothece | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Hormuzakia | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Hornea | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Hornschuchia | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Hornstedtia | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Hornungia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Horocontus | Dysteriida | Lynn (2008) | . | ICZN |
| Horovitzia | Brassicales | Mabberley (2008) | Caricaceae. | ICBN |
| Horridohypnum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Horsfieldia | Magnoliales | Mabberley (2008) | Myristicaceae. | ICBN |
| Horsfordia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Horstia | Helminthomorpha | Deland et al. (2010) | Harrimaniidae. | ICZN |
| Horstrissea | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Hortia | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Hortonia | Laurales | Mabberley (2008) | Monimiaceae. | ICBN |
| Horvatia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Horwoodia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Hosackia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hosea | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Hoshidella | Eugregarinorida | Perkins et al. (2000); Özdikmen (2009) | Substitute name for Loxomorpha. | ICZN |
| Hosiea | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Hoslundia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Hospitella | Allogromiida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hospitellidae. | ICZN |
| Hosta | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Hottea | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Hottonia | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Houbaropsis | Gruiformes | Clements (2007) | . | ICZN |
| Houlletia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Houssayanthus | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Houssayella | Haplosclerida | Manconi & Pronzato (2002) | . | ICZN |
| Houstonia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Houttuynia | Piperales | Mabberley (2008) | Saururaceae. | ICBN |
| Hovanella | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Hovasseiella | Astomatida | Lynn (2008) | . | ICZN |
| Hovea | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hovenia | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Hoverdenia | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Howardella | Clostridiales | Cook et al. (2007) | . | ICNB |
| Howardia | Piperales | Mabberley (2008) | Aristolochiaceae. | ICBN |
| Howea | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Howellia | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Howelliella | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Howittia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Hoya | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Hoyosella | Corynebacteriales | Jurado et al. (2009); Ludwig et al. (2012) | . | ICNB |
| Hrabeyia | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Hsiungella | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Hua | Oxalidales | Mabberley (2008) | Huaceae. | ICBN |
| Huaishuia | Rhodobacterales | Wang et al. (2012) | . | ICNB |
| Huanaca | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Huarpea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hubbardia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hubbardina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Asterigerinatidae. | ICZN |
| Hubbardochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Huberia | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Huberodendron | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Huberopappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hubertia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hubrechtella | Heteronemertea | Gibson (1995); Kajihara et al. (2008) | . | ICZN |
| Hubrechtia | Palaeonemertea | Gibson (1995) | . | ICZN |
| Hubrechtonemertes | Reptantia | Gibson (1995); Kajihara et al. (2008) | Junior synonym of Punnettia. | ICZN |
| Hudsonia | Malvales | Mabberley (2008) | Cistaceae. | ICBN |
| Huernia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Huertea | Huerteales | Mabberley (2008) | Tapisciaceae. | ICBN |
| Hughesia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hugonia | Malpighiales | Mabberley (2008) | Linaceae. | ICBN |
| Huia | Anura | Vitt & Caldwell (2009) | Ranidae. | ICZN |
| Huidobria | Cornales | Mabberley (2008) | Loasaceae. | ICBN |
| Huilaea | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Huilkalineus | Heteronemertea | Gibson (1995) | . | ICZN |
| Huilkia | Heteronemertea | Gibson (1995) | . | ICZN |
| Hulemacanthus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Hullettia | Rosales | Mabberley (2008) | Moraceae. | ICBN |
| Hulsea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hulteniella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Humbertacalia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Humbertia | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Humbertianthus | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Humbertiella | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Humbertiodendron | Malpighiales | Mabberley (2008) | Trigoniaceae. | ICBN |
| Humbertioturraea | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Humbertochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Humblotia | Passeriformes | Clements (2007) | . | ICZN |
| Humboldtia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Humeocline | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Humerana | Anura | Vitt & Caldwell (2009) | Ranidae. | ICZN |
| Humibacillus | Micrococcales | Kageyama et al. (2008); Ludwig et al. (2012) | . | ICNB |
| Humibacter | Micrococcales | Vaz-Moreira et al. (2008); Ludwig et al. (2012) | . | ICNB |
| Humicoccus | Frankiales | Yoon et al. (2007); Ludwig et al. (2012) | . | ICNB |
| Humihabitans | Micrococcales | Kageyama et al. (2007); Ludwig et al. (2012) | . | ICNB |
| Humiria | Malpighiales | Mabberley (2008) | Humiriaceae. | ICBN |
| Humiriastrum | Malpighiales | Mabberley (2008) | Humiriaceae. | ICBN |
| Hummbrella | Plocamiales | Schneider & Wynne (2007) | . | ICBN |
| Humularia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Humulus | Rosales | Mabberley (2008) | Cannabaceae. | ICBN |
| Hunga | Malpighiales | Mabberley (2008) | Chrysobalanaceae. | ICBN |
| Hunnemannia | Ranunculales | Mabberley (2008) | Papaveraceae. | ICBN |
| Hunteria | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Huntleya | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hunzikeria | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Huodendron | Ericales | Mabberley (2008) | Styracaceae. | ICBN |
| Huperzia | Lycopodiales | Christenhusz et al. (2011) | . | ICBN |
| Hura | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Husseya | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Hutchinsonia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Huttonaea | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hwanghaeicola | Rhodobacterales | Kim et al. (2010) | . | ICNB |
| Hyacinthella | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Hyacinthoides | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Hyacinthus | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Hyaena | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Hyaenanche | Malpighiales | Mabberley (2008) | Picrodendraceae. | ICBN |
| Hyalangium | Myxococcales | Garrity et al. (2005) | . | ICNB |
| Hyalascus | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Hyalinea | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Planulinidae. | ICZN |
| Hyalinobatrachium | Anura | Vitt & Caldwell (2009) | Centrolenidae. | ICZN |
| Hyalinocysta | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Hyalinonetrion | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Lagenidae. | ICZN |
| Hyalis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hyalocalyx | Malpighiales | Mabberley (2008) | Passifloraceae. | ICBN |
| Hyalocaulus | Hexactinosida | Reiswig (2002) | . | ICZN |
| Hyalochaete | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hyalochlamys | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hyalocylix | Hibberdiales | Kristiansen & Preisig (2001) | Stylococcaceae. | ICBN |
| Hyalocystis | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Hyalodiscus | | Smirnov et al. (2011) | Domain Eucarya - Phylum Amoebozoa - Class Discosea; Hyalodiscidae. | ICZN |
| Hyaloklossia | Eucoccidiorida | Modrý et al. (2001) | . | ICZN |
| Hyalolaena | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Hyalolepidozia | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Hyalolithus | Prymnesiales | Yoshida et al. (2006) | Prymnesiaceae. | ICBN |
| Hyalonema | Amphidiscosida | Tabachnick & Menshenina (2002) | . | ICZN |
| Hyaloperonospora | Peronosporales | Kirk et al. (2008) | Peronosporaceae. | ICBN |
| Hyalophacus | Euglenales | Leedale (1967); Leedale (2000); Marin et al. (2003) | Synonymous to Phacus. | ICBN |
| Hyalophysa | Apostomatida | Lynn (2008) | . | ICZN |
| Hyaloplacoida | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Hyaloselene | Thaumatomonadida | Howe et al. (2011) | . | ICZN |
| Hyaloseris | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hyalosiphonia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Hyalosperma | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hyalosphenia | Arcellinida | Meisterfeld (2000) | Difflugina -- Hyalospheniidae. | ICZN |
| Hyalospira | Apostomatida | Lynn (2008) | Later synonym of Gymnodinioides. | ICZN |
| Hyalospora | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Hyalosporina | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Hyalostylus | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Hyalotheca | Desmidiales | Gontcharov (2008) | . | ICBN |
| Hyattella | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Hybanthopsis | Malpighiales | Mabberley (2008) | Violaceae. | ICBN |
| Hybanthus | Malpighiales | Mabberley (2008) | Violaceae. | ICBN |
| Hybochilus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hybocodon | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Hybomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Hybridella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hydatella | Nymphaeales | Mabberley (2008) | Hydatellaceae. | ICBN |
| Hydatinophagus | Saprolegniales | Dick (2001); Kirk et al. (2008) | Saprolegniaceae. | ICBN |
| Hydnocarpus | Malpighiales | Mabberley (2008) | Achariaceae. | ICBN |
| Hydnophora | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Hydnophytum | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Hydnora | Piperales | Mabberley (2008) | Hydnoraceae. | ICBN |
| Hydomates | Caudata | Vitt & Caldwell (2009) | Plethodontidae. | ICZN |
| Hydra | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Hydrablabes | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Hydractinia | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Hydraethiops | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Hydrallmania | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Hydramoeba | Euamoebida | Rogerson & Patterson (2000); Smirnov et al. (2005) | . | ICZN |
| Hydrangea | Cornales | Mabberley (2008) | Hydrangeaceae. | ICBN |
| Hydranthea | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Hydrastis | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Hydrelaps | Squamata | Vitt & Caldwell (2009) | Serpentes. Elapidae. | ICZN |
| Hydriastele | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Hydrichthella | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Hydrichthys | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Hydrictis | Carnivora | Wozencraft (2005) | . | ICZN |
| Hydrilla | Alismatales | Mabberley (2008) | Hydrocharitaceae. | ICBN |
| Hydrobates | Procellariiformes | Clements (2007) | . | ICZN |
| Hydrobryum | Malpighiales | Mabberley (2008) | Podostemaceae. | ICBN |
| Hydrocarboniphaga | Xanthomonadales | Palleroni et al. (2004) | . | ICNB |
| Hydrocera | Ericales | Mabberley (2008) | Balsaminaceae. | ICBN |
| Hydrochaeris | Rodentia | McKenna & Bell (1997); Woods & Kilpatrick (2005) | Later synonym of Hydrochoerus. | ICZN |
| Hydrocharis | Alismatales | Mabberley (2008) | Hydrocharitaceae. | ICBN |
| Hydrochoerella | Vestibuliferida | Lynn (2008) | . | ICZN |
| Hydrochoerus | Rodentia | Woods & Kilpatrick (2005) | Earlier synonym of Hydrochaeris. | ICZN |
| Hydrochorea | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hydrochous | Apodiformes | Clements (2007) | . | ICZN |
| Hydrocleys | Alismatales | Mabberley (2008) | Alismataceae. | ICBN |
| Hydrococcus | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Hydrocoleum | Oscillatoriales | Hoffmann et al. (2005) | . | ICBN |
| Hydrocorella | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Hydrocoryne | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Hydrocoryne | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Hydrocotyle | Apiales | Mabberley (2008) | Araliaceae. | ICBN |
| Hydrocryphaea | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Hydrodamalis | Sirenia | Shoshani (2005) | Recently extinct. | ICZN |
| Hydrodendron | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Hydrodynastes | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Hydrogaster | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Hydrogenimonas | Campylobacterales | Takai et al. (2004) | . | ICNB |
| Hydrogenivirga | Aquificales | Nakagawa et al. (2004) | . | ICNB |
| Hydrogenoanaerobacterium | Clostridiales | Song & Dong (2009) | . | ICNB |
| Hydrogenobacter | Aquificales | Garrity et al. (2005) | . | ICNB |
| Hydrogenobaculum | Aquificales | Garrity et al. (2005) | . | ICNB |
| Hydrogenophaga | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Hydrogenophilus | Hydrogenophilales | Garrity et al. (2005) | . | ICNB |
| Hydrogenothermus | Aquificales | Garrity et al. (2005) | . | ICNB |
| Hydrogenovibrio | Thiotrichales | Garrity et al. (2005) | . | ICNB |
| Hydroidea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hydrolaetare | Anura | Vitt & Caldwell (2009) | Leptodactylidae. | ICZN |
| Hydrolagus | Chimaeriformes | Nelson (2006) | . | ICZN |
| Hydrolea | Lamiales | Mabberley (2008) | Hydroleaceae. | ICBN |
| Hydrolithon | Corallinales | Schneider & Wynne (2007) | . | ICBN |
| Hydrolythrum | Myrtales | Mabberley (2008) | Lythraceae. | ICBN |
| Hydromedusa | Testudinata | Vitt & Caldwell (2009) | Chelidae. | ICZN |
| Hydromorphus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Hydromys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Hydropectis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hydrophasianus | Charadriiformes | Clements (2007) | . | ICZN |
| Hydrophilus | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Hydrophis | Squamata | Vitt & Caldwell (2009) | Serpentes. Elapidae. | ICZN |
| Hydrophylax | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Hydrophyllum | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Hydropogon | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Hydropogonella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Hydropotes | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Hydroprogne | Charadriiformes | Clements (2007) | . | ICZN |
| Hydrops | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Hydropsalis | Caprimulgiformes | Clements (2007) | . | ICZN |
| Hydropuntia | Gracilariales | Schneider & Wynne (2007) | . | ICBN |
| Hydrosaurus | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Hydrostachys | Cornales | Mabberley (2008) | Hydrostachyaceae. | ICBN |
| Hydrotalea | Sphingobacteriales | Kämpfer et al. (2011) | . | ICNB |
| Hydrothauma | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hydrothrix | Commelinales | Mabberley (2008) | Pontederiaceae. | ICBN |
| Hydrotriche | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Hydrurga | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Hydrurus | | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Domain Eucarya - Kingdom Straminipila - Phylum Ochrophyta - Class Chrysophyceae. Hydruraceae. | ICBN |
| Hyella | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Hyemoschus | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Hygroamblystegium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Hygrobiella | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Hygrochilus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hygrochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hygrodicranum | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Hygrohypnella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Hygrohypnum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Hygrolembidium | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Hygrophila | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Hygroryza | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hyla | Anura | Vitt & Caldwell (2009) | Hylidae. | ICZN |
| Hylacola | Passeriformes | Clements (2007) | . | ICZN |
| Hyladelphys | Didelphimorphia | Gardner (2005) | . | ICZN |
| Hylaea | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Hylaeanthe | Zingiberales | Mabberley (2008) | Marantaceae. | ICBN |
| Hylaeorchis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hylandia | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Hylarana | Anura | Vitt & Caldwell (2009) | Ranidae. | ICZN |
| Hylebates | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hylemonella | Burkholderiales | Spring et al. (2004) | . | ICNB |
| Hylenaea | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Hylexetastes | Passeriformes | Clements (2007) | . | ICZN |
| Hylia | Passeriformes | Clements (2007) | . | ICZN |
| Hyliota | Passeriformes | Clements (2007) | . | ICZN |
| Hylobates | Primates | McKenna & Bell (1997) | . | ICZN |
| Hylocarpa | Malpighiales | Mabberley (2008) | Humiriaceae. | ICBN |
| Hylocereus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Hylocharis | Apodiformes | Clements (2007) | . | ICZN |
| Hylochoerus | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Hylocichla | Passeriformes | Clements (2007) | . | ICZN |
| Hylocitrea | Passeriformes | Clements (2007) | . | ICZN |
| Hylocomiastrum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Hylocomiopsis | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Hylocomium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Hylocryptus | Passeriformes | Clements (2007) | . | ICZN |
| Hyloctistes | Passeriformes | Clements (2007) | . | ICZN |
| Hylodendron | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hylodes | Anura | Vitt & Caldwell (2009) | Hylodidae. | ICZN |
| Hylodesmum | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hylomanes | Coraciiformes | Clements (2007) | . | ICZN |
| Hylomantis | Anura | Vitt & Caldwell (2009) | Hylidae. | ICZN |
| Hylomecon | Ranunculales | Mabberley (2008) | Papaveraceae. | ICBN |
| Hylomys | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Hylomyscus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Hylonomoipos | Euonychophora | Reid (1996) | Peripatopsidae. | ICZN |
| Hylonycteris | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Hylonympha | Apodiformes | Clements (2007) | . | ICZN |
| Hylopetes | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Hylopezus | Passeriformes | Clements (2007) | . | ICZN |
| Hylophila | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hylophilus | Passeriformes | Clements (2007) | . | ICZN |
| Hylophorbus | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Hylophylax | Passeriformes | Clements (2007) | . | ICZN |
| Hyloplotes | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora. | ICZN |
| Hylorchilus | Passeriformes | Clements (2007) | . | ICZN |
| Hylorina | Anura | Vitt & Caldwell (2009) | Cycloramphidae. | ICZN |
| Hyloscirtus | Anura | Vitt & Caldwell (2009) | Hylidae. | ICZN |
| Hyloxalus | Anura | Vitt & Caldwell (2009) | Dendrobatidae. | ICZN |
| Hymedesmia | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Hymenachne | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hymenaea | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hymenancora | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Hymenandra | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Hymenasplenium | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Hymenena | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Hymenenopsis | Ceramiales | Lin et al. (2012) | . | ICBN |
| Hymeniacidon | Halichondrida | Erpenbeck & Van Soest (2002) | . | ICZN |
| Hymeniastrum | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Hymenidium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Hymenobacter | Cytophagales | Garrity et al. (2005); Ludwig et al. (2011) | . | ICNB |
| Hymenocallis | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Hymenocardia | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Hymenocarpos | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hymenocephalus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hymenochirus | Anura | Vitt & Caldwell (2009) | Pipidae. | ICZN |
| Hymenocladia | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Hymenocladiopsis | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Hymenocoleus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Hymenocrater | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Hymenocystis | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Hymenodictyon | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Hymenodon | Orthodontiales | Stech & Frey (2008); Goffinet et al. (2009) | . | ICBN |
| Hymenodontopsis | Aulacomniales | Stech & Frey (2008); Goffinet et al. (2009) | . | ICBN |
| Hymenogyne | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Hymenolaena | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Hymenolaimus | Anseriformes | Clements (2007) | . | ICZN |
| Hymenolepis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hymenolobium | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hymenoloma | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Hymenolomopsis | Grimmiales | Goffinet et al. (2009) | . | ICBN |
| Hymenomonas | Coccolithales | Jordan et al. (2004) | Hymenomonadaceae. | ICBN |
| Hymenonema | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hymenopappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hymenophyllum | Hymenophyllales | Christenhusz et al. (2011) | . | ICBN |
| Hymenophyton | Fossombroniales | He-Nygrén et al. (2006); Crandall-Stotler et al. (2009) | . | ICBN |
| Hymenops | Passeriformes | Clements (2007) | . | ICZN |
| Hymenopyramis | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Hymenorchis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Hymenosporum | Apiales | Mabberley (2008) | Pittosporaceae. | ICBN |
| Hymenostegia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hymenostemma | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hymenostephium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hymenostyliella | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Hymenostylium | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Hymenothrix | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hymenoxys | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hymeraphia | Poecilosclerida | Hooper (2002) | . | ICZN |
| Hymerhabdia | Halichondrida | Alvarez & Van Soest (2002) | . | ICZN |
| Hymetrochota | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Hynobius | Caudata | Vitt & Caldwell (2009) | Hynobiidae. | ICZN |
| Hyobanche | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Hyocomium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Hyomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Hyophila | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Hyophiladelphus | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Hyophorbe | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Hyosciurus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Hyoscyamus | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Hyoseris | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hyospathe | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Hypacanthium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hypagophytum | Saxifragales | Mabberley (2008) | Crassulaceae. | ICBN |
| Hypargos | Passeriformes | Clements (2007) | . | ICZN |
| Hyparrhenia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hypechiniscus | Echiniscoidea | Kinchin (1994) | . | ICZN |
| Hypecoum | Ranunculales | Mabberley (2008) | Papaveraceae. | ICBN |
| Hypelate | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Hypenia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Hyperacanthus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Hyperacrius | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Hyperammina | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hippocrepinidae. | ICZN |
| Hyperamoeba | Physarales | Michel et al. (2003); Fiore-Donno et al. (2010) | Later synonym of Physarum. | ICBN |
| Hyperbaena | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Hyperdevescovina | Cristamonadida | Cepicka et al. (2010) | . | ICZN |
| Hypergerus | Passeriformes | Clements (2007) | . | ICZN |
| Hypericophyllum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hypericum | Malpighiales | Mabberley (2008) | Hypericaceae. | ICBN |
| Hyperidion | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Hyperolius | Anura | Vitt & Caldwell (2009) | Hyperoliidae. | ICZN |
| Hyperoodon | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Cetacea. | ICZN |
| Hypertelis | Caryophyllales | Mabberley (2008) | Molluginaceae. | ICBN |
| Hyperthelia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hyperthermus | Desulfurococcales | Garrity et al. (2005) | . | ICNB |
| Hyphaene | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Hyphochytrium | Hyphochytriales | Dick (2001); Kirk et al. (2008) | Hyphochytriaceae. | ICBN |
| Hyphomicrobium | Rhizobiales | Garrity et al. (2005) | . | ICNB |
| Hyphomonas | | Garrity et al. (2005); Williams et al. (2007) | Domain Bacteria - Phylum Proteobacteria - Class Alphaproteobacteria. Hyphomonadaceae. | ICNB |
| Hyphomorpha | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Hypnale | Squamata | Vitt & Caldwell (2009) | Serpentes. Viperidae. | ICZN |
| Hypnea | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Hypnella | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Hypnelus | Galbuliformes | Clements (2007) | . | ICZN |
| Hypneocolax | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Hypnobartlettia | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Hypnodendron | Hypnodendrales | Goffinet et al. (2009) | . | ICBN |
| Hypnodinium | Phytodiniales | Fensome et al. (1993) | . | ICBN |
| Hypnodontopsis | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Hypnogorgia | Alcyonacea | Bayer (1981) | Plexauridae. | ICZN |
| Hypnos | Torpediniformes | Nelson (2006) | . | ICZN |
| Hypnum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Hypobathrum | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Hypobythius | Phlebobranchia | Monniot & Monniot (1972) | Octacnemidae. | ICZN |
| Hypocalymma | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Hypocalyptus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hypochaeris | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hypocnemis | Passeriformes | Clements (2007) | . | ICZN |
| Hypocnemoides | Passeriformes | Clements (2007) | . | ICZN |
| Hypocolius | Passeriformes | Clements (2007) | . | ICZN |
| Hypocoma | Hypocomatida | Lynn (2008) | . | ICZN |
| Hypocomagalma | Rhynchodida | Lynn (2008) | . | ICZN |
| Hypocomatidium | Rhynchodida | Lynn (2008) | . | ICZN |
| Hypocomella | Rhynchodida | Lynn (2008) | . | ICZN |
| Hypocomides | Rhynchodida | Lynn (2008) | . | ICZN |
| Hypocomidium | Rhynchodida | Lynn (2008) | . | ICZN |
| Hypocomina | Rhynchodida | Lynn (2008) | . | ICZN |
| Hypocryptadius | Passeriformes | Clements (2007) | . | ICZN |
| Hypodaphnis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Hypodematium | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Hypoderris | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Hypodiscus | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Hypodistoma | Aplousobranchia | Monniot & Monniot (1972); Kott (1998) | Holozoidae. | ICZN |
| Hypodontium | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Hypoechinorhynchus | Echinorhynchida | Amin (1985) | . | ICZN |
| Hypoedaleus | Passeriformes | Clements (2007) | . | ICZN |
| Hypoestes | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Hypogaleus | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Hypogeomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Hypogeophis | Gymnophiona | Vitt & Caldwell (2009) | "Caeciliidae". | ICZN |
| Hypoglossum | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Hypogomphia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Hypogramma | Passeriformes | Clements (2007) | . | ICZN |
| Hypoisotachis | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Hypolaena | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Hypolepis | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Hypolobus | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Hypolytrum | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Hypopachus | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Hypopitys | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Hypopterygium | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Hypoptophis | Squamata | Vitt & Caldwell (2009) | Serpentes. Atractaspididae. | ICZN |
| Hypopyrrhus | Passeriformes | Clements (2007) | . | ICZN |
| Hypopyxis | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Hyporhamma | Trichiales | Lado (2001); Lado et al. (2005) | Rejected earlier synonym of Hemitrichia. | ICBN |
| Hypositta | Passeriformes | Clements (2007) | . | ICZN |
| Hypothymis | Passeriformes | Clements (2007) | . | ICZN |
| Hypotrichidium | Stichotrichida | Lynn (2008) | . | ICZN |
| Hypotrichomonas | Hypotrichomonadida | Cepicka et al. (2010) | . | ICZN |
| Hypoxidia | Asparagales | Mabberley (2008) | Hypoxidaceae. | ICBN |
| Hypoxis | Asparagales | Mabberley (2008) | Hypoxidaceae. | ICBN |
| Hypselodelphys | Zingiberales | Mabberley (2008) | Marantaceae. | ICBN |
| Hypseocharis | Geraniales | Mabberley (2008) | Geraniaceae. | ICBN |
| Hypseochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hypserpa | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Hypsibius | Parachela | Kinchin (1994) | . | ICZN |
| Hypsiboas | Anura | Vitt & Caldwell (2009) | Hylidae. | ICZN |
| Hypsicalotes | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Hypsiglena | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Hypsignathus | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Hypsilurus | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Hypsipetes | Passeriformes | Clements (2007) | . | ICZN |
| Hypsiprymnodon | Australidelphia | McKenna & Bell (1997) | . | ICZN |
| Hypsirhynchus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Hypsistozoa | Aplousobranchia | Monniot & Monniot (1972); Kott (1998) | Holozoidae. | ICZN |
| Hypsophila | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Hypsugo | Chiroptera | Simmons (2005) | . | ICZN |
| Hyptianthera | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Hyptidendron | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Hyptis | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Hyrtios | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Hyssopus | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Hysterionica | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hysterocineta | Thigmotrichida | Lynn (2008) | . | ICZN |
| Hysterocinetoides | Thigmotrichida | Lynn (2008) | . | ICZN |
| Hysterophrya | Astomatida | Lynn (2008) | . | ICZN |
| Hystrichaspis | Arthracanthida | Febvre et al. (2000) | . | ICZN |
| Hystrichophora | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Hystrix | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Hystrix | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Hyunsoonleella | Flavobacteriales | Yoon et al. (2010) | . | ICNB |
| I | |
| Ia | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Iago | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Ialtris | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Iamia | Acidimicrobiales | Kurahashi et al. (2009); Ludwig et al. (2012) | . | ICNB |
| Ianhedgea | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Ianthella | Verongida | Bergquist & Cook (2002) | . | ICZN |
| Ianthopappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Iasis | Salpida | Godeaux (1998) | Iasis Savigny 1816, non Iasis Lahille 1890. | ICZN |
| Iasis | Salpida | Kott (1998) | Iasis Lahille 1890 is a junior homonym of Iasis Savigny 1816. Replaced by Soestia. | ICZN |
| Iberis | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Iberolacerta | Squamata | Vitt & Caldwell (2009) | Lacertidae. | ICZN |
| Ibervillea | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Ibicella | Lamiales | Mabberley (2008) | Martyniaceae. | ICBN |
| Ibidorhyncha | Charadriiformes | Clements (2007) | . | ICZN |
| Ibirhynchus | Polymorphida | García-Varela et al. (2011) | Polymorphidae. | ICZN |
| Ibycter | Falconiformes | Clements (2007) | . | ICZN |
| Icacina | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Ichnanthus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Ichneumia | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Ichnocarpus | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Ichnotropis | Squamata | Vitt & Caldwell (2009) | Lacertidae. | ICZN |
| Ichthydium | Chaetonotida | Balsamo et al. (2009); Hummon & Todaro (2010) | . | ICZN |
| Ichthyobodo | Prokinetoplastida | Moreira et al. (2004) | . | ICZN |
| Ichthyodinium | Syndinida | Fensome et al. (1993) | . | ICZN |
| Ichthyomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Ichthyomyzon | Petromyzontiformes | Nelson (2006) | . | ICZN |
| Ichthyonyctus | Clevelandellida | Lynn (2008) | . | ICZN |
| Ichthyophaga | Falconiformes | Clements (2007) | . | ICZN |
| Ichthyophis | Gymnophiona | Vitt & Caldwell (2009) | Ichthyophiidae. | ICZN |
| Ichthyophonus | Ichthyophonida | Mendoza et al. (2002) | . | ICZN |
| Ichthyophthirioides | Ophryoglenida | Lynn (2008) | Later synonym of Ichthyophthirius?. | ICZN |
| Ichthyophthirius | Ophryoglenida | Lynn (2008) | . | ICZN |
| Ichthyophyllum | Peritrichida | Lynn (2008); Zhan et al. (2009) | Nomen dubium. | ICZN |
| Ichthyosporidium | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Ichthyostoma | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Ichthyothere | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Ichtyocerucus | Desmidiales | Gontcharov (2008) | . | ICBN |
| Ichtyodontium | Desmidiales | Gontcharov (2008) | . | ICBN |
| Iciligorgia | Alcyonacea | Bayer (1981) | Anthothelidae. | ICZN |
| Icosaspis | Arthracanthida | Febvre et al. (2000) | . | ICZN |
| Icteria | Passeriformes | Clements (2007) | . | ICZN |
| Icterus | Passeriformes | Clements (2007) | . | ICZN |
| Ictinaetus | Falconiformes | Clements (2007) | . | ICZN |
| Ictinia | Falconiformes | Clements (2007) | . | ICZN |
| Ictonyx | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Icuria | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Idahoa | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Ideogorgia | Alcyonacea | Bayer (1981) | Keroeididae. | ICZN |
| Ideonella | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Idesia | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Idiellana | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Idiocolpoda | Colpodida | Lynn (2008) | . | ICZN |
| Idiocranium | Gymnophiona | Vitt & Caldwell (2009) | "Caeciliidae". | ICZN |
| Idiomarina | Alteromonadales | Garrity et al. (2005) | . | ICNB |
| Idionycteris | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Idionympha | Trichonymphida | Cepicka et al. (2010) | . | ICZN |
| Idiopappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Idiopsar | Passeriformes | Clements (2007) | . | ICZN |
| Idiospermum | Laurales | Mabberley (2008) | Calycanthaceae. | ICBN |
| Idiothamnus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Idiotrochus | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Idiurus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Ifalukella | Alcyonacea | Bayer (1981) | Ifalukellidae. | ICZN |
| Ifloga | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Ifrita | Passeriformes | Clements (2007) | . | ICZN |
| Igernella | Dendroceratida | Bergquist & Cook (2002) | . | ICZN |
| Igidia | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Ignatzschineria | Xanthomonadales | Tóth et al. (2007) | Replaced name of "Schineria". | ICNB |
| Ignavibacterium | Ignavibacteriales | Iino et al. (2010) | . | ICNB |
| Ignavigranum | Lactobacillales | Garrity et al. (2005) | . | ICNB |
| Ignicoccus | Desulfurococcales | Garrity et al. (2005) | . | ICNB |
| Ignisphaera | Desulfurococcales | Niederbeger et al. (2006) | . | ICNB |
| Ignotocoma | Rhynchodida | Lynn (2008) | . | ICZN |
| Iguana | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Iguanognathus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Iguanura | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Ihlea | Salpida | Godeaux (1998) | . | ICZN |
| Ihlenfeldtia | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Ijimadictyum | Aulocalycoida | Reiswig (2002) | . | ICZN |
| Ijimaiella | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Ikonnikovia | Caryophyllales | Mabberley (2008) | Plumbaginaceae. | ICBN |
| Ileonema | Haptorida | Lynn (2008) | . | ICZN |
| Ileostylus | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Ilex | Aquifoliales | Mabberley (2008) | Aquifoliaceae. | ICBN |
| Iliamna | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Ilicura | Passeriformes | Clements (2007) | . | ICZN |
| Iljinia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Illadopsis | Passeriformes | Clements (2007) | . | ICZN |
| Illecebrum | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Illicium | Austrobaileyales | Mabberley (2008) | Schisandraceae. | ICBN |
| Illigera | Laurales | Mabberley (2008) | Hernandiaceae. | ICBN |
| Illiosentis | Echinorhynchida | Monks & Pulido-Flores (2002) | Illiosentidae. | ICZN |
| Ilsiella | Colpodida | Lynn (2008) | . | ICZN |
| Ilsteria | Mischococcales | Ettl (1978) | . | ICBN |
| Ilumatobacter | Acidimicrobiales | Matsumoto et al. (2009); Ludwig et al. (2012) | . | ICNB |
| Ilyactis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Ilyobacter | Fusobacteriales | Garrity et al. (2005) | . | ICNB |
| Imantodes | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Imantonia | Prymnesiales | Edvardsen et al. (2000); Jordan et al. (2004) | Prymnesiaceae. | ICBN |
| Imbribryum | Bryales | Pedersen & Hedenäs (2005); Pedensen (2005) | Now checking. | ICBN |
| Imeria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Imerinaea | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Impatiens | Ericales | Mabberley (2008) | Balsaminaceae. | ICBN |
| Imperata | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Imperatoria | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Imtechella | Flavobacteriales | Surendra et al. (2012) | . | ICNB |
| Inactis | Pseudanabaenales | Hoffmann et al. (2005) | . | ICBN |
| Inaequalina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Spiroloculinidae. | ICZN |
| Incana | Passeriformes | Clements (2007) | . | ICZN |
| Incarvillea | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Incaspiza | Passeriformes | Clements (2007) | . | ICZN |
| Incrustatus | Alcyonacea | van Ofwegen et al. (2006) | Clavulariidae. | ICZN |
| Indagator | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| India | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Indibacter | Cytophagales | Anil Kumar et al. (2010); Ludwig et al. (2011) | . | ICNB |
| Indicator | Piciformes | Clements (2007) | . | ICZN |
| Indigastrum | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Indigofera | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Indirana | Anura | Vitt & Caldwell (2009) | Ranixalidae. | ICZN |
| Indobanalia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Indocalamus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Indofevillea | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Indomelothria | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Indonyctus | Clevelandellida | Lynn (2008) | . | ICZN |
| Indopacetus | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Cetacea. | ICZN |
| Indophyllia | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Indopiptadenia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Indopoa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Indopolysolenia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Indorhynchus | Echinorhynchida | Amin (1985) | . | ICZN |
| Indorouchera | Malpighiales | Mabberley (2008) | Linaceae. | ICBN |
| Indosasa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Indoschulzia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Indosinia | Malpighiales | Mabberley (2008) | Ochnaceae. | ICBN |
| Indotestudo | Testudinata | Vitt & Caldwell (2009) | Testudinidae. | ICZN |
| Indotristicha | Malpighiales | Mabberley (2008) | Podostemaceae. | ICBN |
| Indotyphlus | Gymnophiona | Vitt & Caldwell (2009) | "Caeciliidae". | ICZN |
| Indri | Primates | McKenna & Bell (1997) | . | ICZN |
| Indusiella | Grimmiales | Goffinet et al. (2009) | . | ICBN |
| Inermichona | Cryptogemmida | Lynn (2008) | . | ICZN |
| Inezia | Passeriformes | Clements (2007) | . | ICZN |
| Inezia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Inferiolabiata | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Inferostoma | Clevelandellida | Lynn (2008) | . | ICZN |
| Inflatana | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Inflatella | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Inflatocalyx | Alcyonacea | Verseveldt & Bayer (1988) | Alcyoniidae. | ICZN |
| Infundibulorium | Vestibuliferida | Lynn (2008) | . | ICZN |
| Inga | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Ingerana | Anura | Vitt & Caldwell (2009) | Dicroglossidae. | ICZN |
| Ingerophrynus | Anura | Vitt & Caldwell (2009) | Bufonidae. | ICZN |
| Ingotia | Alcyonacea | Alderslade (2001) | Xeniidae. | ICZN |
| Inhambanella | Ericales | Mabberley (2008) | Sapotaceae. | ICBN |
| Inhella | Burkholderiales | Song et al. (2009) | . | ICNB |
| Inia | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Cetacea. | ICZN |
| Inkyuleea | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Inocarpus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Inodosporus | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Inquilinus | Rhodospirillales | Garrity et al. (2005) | . | ICNB |
| Insignicoma | Rhynchodida | Lynn (2008) | . | ICZN |
| Insolitispirillum | Rhodospirillales | Yoon et al. (2007) | . | ICNB |
| Interfilum | Klebsormidiales | Mikhailyuk et al. (2008) | . | ICBN |
| Internatus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Interthamnion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Intexta | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Intoshellina | Astomatida | Lynn (2008) | . | ICZN |
| Intoshia | Orthonectida | Kozloff (1992) | . | ICZN |
| Intranstylum | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Intrasporangium | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Intsia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Inula | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Inulanthera | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Inuloides | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Inulopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Inversochona | Cryptogemmida | Lynn (2008) | . | ICZN |
| Involucrana | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Involutarena | Lituolida | Kaminski (2008) | Haplophragmoididae. | ICZN |
| Involvohauerina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Io | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Ioanella | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Eponididae. | ICZN |
| Iochroma | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Iodanthus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Iodes | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Iodina | Santalales | Mabberley (2008) | Santalaceae. | ICBN |
| Iodobacter | Neisseriales | Garrity et al. (2005) | . | ICNB |
| Iodocepalus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Iodopleura | Passeriformes | Clements (2007) | . | ICZN |
| Iogeton | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Iole | Passeriformes | Clements (2007) | . | ICZN |
| Iomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Ionacanthus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Ionactis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Ione | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Ionia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Ionopsis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Iophon | Poecilosclerida | Hooper (2002) | . | ICZN |
| Iosactis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Iostephane | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Iotasperma | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Iotroata | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Iotrochopsamma | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Iotrochota | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Ipheion | Asparagales | Mabberley (2008) | Alliaceae. | ICBN |
| Iphigenia | Liliales | Mabberley (2008) | Colchicaceae. | ICBN |
| Iphinoe | Nostocales | Lamprinou et al. (2011) | Originally assigned to Stigonematales. | ICBN |
| Iphiona | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Iphionopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Iphisa | Squamata | Vitt & Caldwell (2009) | Gymnophthalmidae. | ICZN |
| Iphiteon | Hexactinosida | Reiswig (2002) | . | ICZN |
| Ipoa | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Komokiidae. | ICZN |
| Ipomoea | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Ipomopsis | Ericales | Mabberley (2008) | Polemoniaceae. | ICBN |
| Ipsea | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Iranecio | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Irania | Passeriformes | Clements (2007) | . | ICZN |
| Ircinia | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Irediparra | Charadriiformes | Clements (2007) | . | ICZN |
| Irelandia | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Irena | Passeriformes | Clements (2007) | . | ICZN |
| Irenella | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Irenepharsus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Irenita | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ellipsolagenidae. | ICZN |
| Irenium | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Irenomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Iresine | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Iriartea | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Iriartella | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Iridaea | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Iridia | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hemisphaeramminidae. | ICZN |
| Iridogorgia | Alcyonacea | Bayer (1981) | Chrysogorgiidae. | ICZN |
| Iridophanes | Passeriformes | Clements (2007) | . | ICZN |
| Iridophycus | Gigartinales | Schneider & Wynne (2007) | Later synonym of Mazzaella. | ICBN |
| Iridosma | Sapindales | Mabberley (2008) | Simaroubaceae. | ICBN |
| Iridosornis | Passeriformes | Clements (2007) | . | ICZN |
| Iris | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Irlbachia | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Irolita | Rajiformes | Nelson (2006) | . | ICZN |
| Irtugovia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Irvinea | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Irvingbaileya | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Irvingia | Malpighiales | Mabberley (2008) | Irvingiaceae. | ICBN |
| Irwinia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Iryanthera | Magnoliales | Mabberley (2008) | Myristicaceae. | ICBN |
| Isabbottia | Cryptonemiales | Silva (2002); Schneider & Wynne (2007) | . | ICBN |
| Isabelia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Isabella | | Schlacher-Hoenlinger et al. (2005) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids) Corallistidae. | ICZN |
| Isachne | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Isactinernus | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Isactinia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Isactis | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Isanemonia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Isantheopsis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Isanthus | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Isapiactis | Ceriantharia | Tiffon (1987) | . | ICZN |
| Isarachnactis | Ceriantharia | Tiffon (1987) | . | ICZN |
| Isarachnanthus | Ceriantharia | Tiffon (1987) | . | ICZN |
| Isatis | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Isaurus | Zoanthidea | Sinniger et al. (2005) | . | ICZN |
| Ischaemum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Ischnea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Ischnocnema | Anura | Vitt & Caldwell (2009) | Brachycephalidae. | ICZN |
| Ischnogyne | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Ischnolepis | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Ischnosiphon | Zingiberales | Mabberley (2008) | Marantaceae. | ICBN |
| Ischyrodon | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Ischyrolepis | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Ischyronemertes | Eumonostilifera | Gibson (1995); Chernyshev (2003) | . | ICZN |
| Iseilema | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Isertia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Ishamella | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Isidella | Alcyonacea | Bayer (1981) | Isididae. | ICZN |
| Isidodendron | Malpighiales | Mabberley (2008) | Trigoniaceae. | ICBN |
| Isidoides | Alcyonacea | Bayer (1981) | Chrysogorgiidae. | ICZN |
| Isidorea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Isidrogalvia | Alismatales | Mabberley (2008) | Tofieldiaceae. | ICBN |
| Isis | Alcyonacea | Bayer (1981) | Isididae. | ICZN |
| Isistius | Squaliformes | Nelson (2006) | . | ICZN |
| Iskandera | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Islandiella | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cassidulinidae. | ICZN |
| Islandinium | Peridiniales | Head et al. (2001) | . | ICBN |
| Ismelia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Ismene | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Isoachlya | Saprolegniales | Dick (2001); Kirk et al. (2008) | Saprolegniaceae. | ICBN |
| Isoaulactinia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Isobaculum | Lactobacillales | Garrity et al. (2005) | . | ICNB |
| Isoberlinia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Isocarpha | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Isochilus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Isochona | Cryptogemmida | Lynn (2008) | . | ICZN |
| Isochonopsis | Cryptogemmida | Lynn (2008) | . | ICZN |
| Isochromatium | Chromatiales | Garrity et al. (2005) | . | ICNB |
| Isochrysis | Isochrysidales | Edvardsen et al. (2000); Jordan et al. (2004) | Isochrysidaceae. | ICBN |
| Isocladiella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Isocoma | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Isocomides | Rhynchodida | Lynn (2008) | . | ICZN |
| Isocyclidium | Pleuronematida | Lynn (2008) | . | ICZN |
| Isocystis | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Isodactylactis | Ceriantharia | Tiffon (1987) | . | ICZN |
| Isodendrion | Malpighiales | Mabberley (2008) | Violaceae. | ICBN |
| Isodiametra | Acoela | Hooge & Tyler (2005) | . | ICZN |
| Isodictya | Poecilosclerida | Hajdu & Lôbo-Hajdu (2002) | . | ICZN |
| Isodon | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Isodrepanium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Isoedwardsia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Isoetes | Isoetales | Christenhusz et al. (2011) | Isoëtes. | ICBN |
| Isoetopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Isoglossa | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Isogomphodon | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Isohypsibius | Parachela | Kinchin (1994) | . | ICZN |
| Isolembidium | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Isolepis | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Isoleucas | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Isolobodon | Rodentia | Woods & Kilpatrick (2005) | Possibly extinct. | ICZN |
| Isolona | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Isomeris | Brassicales | Mabberley (2008) | Cleomaceae. | ICBN |
| Isometrum | Lamiales | Mabberley (2008); Möller et al. (2011) | Gesneriaceae. Later synonym of Oreocharis. | ICBN |
| Isonandra | Ericales | Mabberley (2008) | Sapotaceae. | ICBN |
| Isonema | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Isoodon | Australidelphia | McKenna & Bell (1997) | . | ICZN |
| Isopaches | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Isopachys | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Isophellia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Isophyllaria | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Isophyllastrea | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Isophyllia | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Isophysis | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Isopogon | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Isops | Astrophorida | Uriz (2002) | . | ICZN |
| Isoptericola | Micrococcales | Stackebrandt et al. (2004); Ludwig et al. (2012) | . | ICNB |
| Isopterygiopsis | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Isopterygium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Isopyrum | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Isoselmis | | Novarino (2003) | Domain Eucarya - Kingdom Cryptobiontes ? - Phylum Cryptophyta ?. | ICBN |
| Isosicyonis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Isosphaera | Planctomycetales | Garrity et al. (2005) | . | ICNB |
| Isospora | Eucoccidiorida | Perkins et al. (2000); Barta et al. (2005) | . | ICZN |
| Isosticha | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora. | ICZN |
| Isostigma | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Isotachis | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Isotealia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Isotheca | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Isothecium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Isothrix | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Isotoma | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Isotrema | Piperales | Mabberley (2008) | Aristolochiaceae. | ICBN |
| Isotria | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Isotricha | Vestibuliferida | Lynn (2008) | . | ICZN |
| Isotropis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Isoulactis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Isovactis | Ceriantharia | Tiffon (1987) | . | ICZN |
| Isozoanthus | Zoanthidea | Sinniger et al. (2005) | . | ICZN |
| Ispidina | Coraciiformes | Clements (2007) | . | ICZN |
| Issia | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Isthmochloron | Mischococcales | Ettl (1978) | . | ICBN |
| Isthmohyla | Anura | Vitt & Caldwell (2009) | Hylidae. | ICZN |
| Isthmomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Isurus | Lamniformes | Nelson (2006) | . | ICZN |
| Itanemertes | Eumonostilifera | Gibson (1995); Chernyshev (2003) | . | ICZN |
| Itapotihyla | Anura | Vitt & Caldwell (2009) | Hylidae. | ICZN |
| Itaquascon | Parachela | Kinchin (1994) | . | ICZN |
| Itasina | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Itatiella | Polytrichales | Goffinet et al. (2009) | . | ICBN |
| Itaya | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Itea | Saxifragales | Mabberley (2008) | Iteaceae. | ICBN |
| Iteadaphne | Laurales | Mabberley (2008) | Lauraceae. | ICBN |
| Ithaginis | Galliformes | Clements (2007) | . | ICZN |
| Ithania | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Ithycyphus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Ithycyphus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Itoa | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Itonoa | Nemastomatales | Schneider & Wynne (2007) | . | ICBN |
| Itura | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Itzaea | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Iva | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Ivania | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Ivanjohnstonia | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Ivodea | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Iwatanemertes | Heteronemertea | Gibson (1995) | . | ICZN |
| Iwatsukia | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Iwatsukiella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Ixanthus | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Ixerba | Crossosomatales | Mabberley (2008) | Ixerbaceae. | ICBN |
| Ixeridium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Ixeris | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Ixia | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Ixianthes | Lamiales | Mabberley (2008) | Stilbaceae. | ICBN |
| Ixiochlamys | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Ixiolaena | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Ixiolirion | Asparagales | Mabberley (2008) | Ixiolirionaceae. | ICBN |
| Ixion | Alcyonacea | Alderslade (2001) | Xeniidae. | ICZN |
| Ixobrychus | Ciconiiformes | Clements (2007) | . | ICZN |
| Ixocactus | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Ixodia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Ixodonerium | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Ixonanthes | Malpighiales | Mabberley (2008) | Ixonanthaceae. | ICBN |
| Ixonotus | Passeriformes | Clements (2007) | . | ICZN |
| Ixophorus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Ixora | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Ixoreus | Passeriformes | Clements (2007) | . | ICZN |
| Ixorheis | Ixorheorida | Perkins et al. (2000) | . | ICZN |
| Ixos | Passeriformes | Clements (2007) | . | ICZN |
| Iyengariella | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Izozogia | Zygophyllales | Mabberley (2008) | Zygophyllaceae. | ICBN |
| Izziella | Nemaliales | Schneider & Wynne (2007) | . | ICBN |
| J | |
| Jaaginema | Pseudanabaenales | Hoffmann et al. (2005) | . | ICBN |
| Jabiru | Ciconiiformes | Clements (2007) | . | ICZN |
| Jablonskia | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Jaborosa | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Jabouilleia | Passeriformes | Clements (2007) | . | ICZN |
| Jacamaralcyon | Galbuliformes | Clements (2007) | . | ICZN |
| Jacamerops | Galbuliformes | Clements (2007) | . | ICZN |
| Jacana | Charadriiformes | Clements (2007) | . | ICZN |
| Jacaranda | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Jacaratia | Brassicales | Mabberley (2008) | Caricaceae. | ICBN |
| Jackiella | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Jackiopsis | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Jacksonia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Jacmaia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Jacobaea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Jacobsenia | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Jacquemontia | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Jacqueshuberia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Jacquinia | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Jacquiniella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Jaculella | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hippocrepinidae. | ICZN |
| Jaculus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Jadammina | Trochamminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Trochamminidae. | ICZN |
| Jadunia | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Jadwigia | | Lindberg et al. (2005) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Dinozoa - Class Dinophyceae. Now checking. | ICBN |
| Jaegeria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Jaegerina | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Jaeschkea | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Jaffueliobryum | Grimmiales | Goffinet et al. (2009) | . | ICBN |
| Jagera | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Jahnella | Myxococcales | Garrity et al. (2005) | Corrected name of "Jahnia".. | ICNB |
| Jahnia | Myxococcales | Garrity et al. (2005) | Later homony. Replaced by Jahnella (see Validation list no. 115). | ICNB |
| Jaimehintonia | Asparagales | Mabberley (2008) | Alliaceae. | ICBN |
| Jakoba | Jakobida | Patterson et al. (2000) | . | ICZN |
| Jalcophila | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Jaliscoa | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Jaltomata | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Jamesbrittenia | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Jamesia | Cornales | Mabberley (2008) | Hydrangeaceae. | ICBN |
| Jamesianthus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Jamesonia | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Jamesoniella | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Janacekia | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Janaria | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Jancaea | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Janczewskia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Janetaescincus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Jania | Corallinales | Schneider & Wynne (2007) | . | ICBN |
| Janibacter | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Janickina | | Patterson et al. (2000); Smirnov et al. (2005); Smirnov et al. (2011) | Domain Eucarya - Phylum Amoebozoa - Subphylum Lobosa. | ICZN |
| Janiopsis | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Jannaschia | Rhodobacterales | Garrity et al. (2005) | . | ICNB |
| Janotia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Jansenella | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Janthinobacterium | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Jantinella | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Janusia | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Jaocorlissia | Tetrahymenida | Lynn (2008) | . | ICZN |
| Jaoniella | Synurales | Kristiansen & Preisig (2001) | Synuraceae. | ICBN |
| Japalura | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Japonochytrium | Thraustochytriales | Dick (2001); Kirk et al. (2008) | Thraustochytriaceae. | ICBN |
| Japonolirion | Petrosaviales | Mabberley (2008) | Petrosaviaceae. | ICBN |
| Jaramilloa | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Jarandersonia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Jarava | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Jarilla | Brassicales | Mabberley (2008) | Caricaceae. | ICBN |
| Jaroschia | Bursariomorphida | Lynn (2008); Foissner et al. (2011) | . | ICZN |
| Jarrellia | Parabodonida | Poynton et al. (2001) | Closely resembling to Trypanoplasma and Cryptobia. | ICZN |
| Jasarum | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Jasione | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Jasminocereus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Jasminum | Lamiales | Mabberley (2008) | Oleaceae. | ICBN |
| Jasonia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Jaspis | Astrophorida | Uriz (2002) | . | ICZN |
| Jateorhiza | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Jatropha | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Jaumea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Javania | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Javorkaea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Jeannellia | Sporadotrichida | Lynn (2008) | Later synonym of Halterioforma?. | ICZN |
| Jedda | Malvales | Mabberley (2008) | Thymelaeaceae. | ICBN |
| Jefea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Jeffersonia | Ranunculales | Mabberley (2008) | Berberidaceae. | ICBN |
| Jeffreya | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Jejuia | Flavobacteriales | Lee et al. (2009) | . | ICNB |
| Jenkina | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Jenmaniella | Malpighiales | Mabberley (2008) | Podostemaceae. | ICBN |
| Jensenia | Fossombroniales | He-Nygrén et al. (2006); Crandall-Stotler et al. (2009) | . | ICBN |
| Jensenobotrya | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Jensia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Jeongeupia | Neisseriales | Yoon et al. (2010) | . | ICNB |
| Jeotgalibacillus | Bacillales | Garrity et al. (2005) | . | ICNB |
| Jeotgalicoccus | Bacillales | Garrity et al. (2005) | . | ICNB |
| Jeppsia | Apostomatida | Lynn (2008) | . | ICZN |
| Jepsonia | Saxifragales | Mabberley (2008) | Saxifragaceae. | ICBN |
| Jerdonia | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Jereicopsis | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids) Azoricidae. | ICZN |
| Jessea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Jhaorihella | Rhodobacterales | Rekha et al. (2011) | . | ICNB |
| Jiangella | Jiangellales | Song et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Jirovecella | Astomatida | Lynn (2008) | . | ICZN |
| Jirovecia | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Jiroveciana | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Jishengella | Micromonosporales | Xie et al. (2011); Ludwig et al. (2012) | Micromonosporaceae. | ICNB |
| Joannesia | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Jobinia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Jodrellia | Asparagales | Mabberley (2008) | Asphodelaceae. | ICBN |
| Joenia | Cristamonadida | Cepicka et al. (2010) | . | ICZN |
| Joenina | Cristamonadida | Cepicka et al. (2010) | . | ICZN |
| Joenoides | Cristamonadida | Cepicka et al. (2010) | . | ICZN |
| Joenopsis | Cristamonadida | Cepicka et al. (2010) | . | ICZN |
| Johannesbaptistia | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Johanneshowellia | Caryophyllales | Mabberley (2008) | Polygonaceae. | ICBN |
| Johannesteijsmannia | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Johenrea | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Johnsonella | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Johnsonia | Asparagales | Mabberley (2008) | Hemerocallidaceae. | ICBN |
| Johrenia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Johreniopsis | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Joinvillea | Poales | Mabberley (2008) | Joinvilleaceae. | ICBN |
| Jollydora | Oxalidales | Mabberley (2008) | Connaraceae. | ICBN |
| Jomonlithus | Coccolithales | Jordan et al. (2004) | Hymenomonadaceae ? or Pleurochrysidaceae ?. | ICBN |
| Jonesia | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Jonesiobryum | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Jonquetella | Synergistales | Jumas-Bilak et al. (2007); Jumas-Bilak et al. (2009) | . | ICNB |
| Joosia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Joostella | Flavobacteriales | Quan et al. (2008) | . | ICNB |
| Jordaaniella | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Joseanthus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Josephinia | Lamiales | Mabberley (2008) | Pedaliaceae. | ICBN |
| Jouvea | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Jovellana | Lamiales | Mabberley (2008) | Calceolariaceae. | ICBN |
| Jovetia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Joycea | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Joyeuxella | Piroplasmorida | Perkins et al. (2000) | . | ICZN |
| Juania | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Juanulloa | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Jubaea | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Jubaeopsis | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Jubanyella | Narcomedusae | Fuentes & Pagès (2006) | . | ICZN |
| Jubelina | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Jubula | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Jubula | Strigiformes | Clements (2007) | . | ICZN |
| Jubulopsis | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Jugimurammina | Astrorhizida | Kaminski (2008) | Jugimuramminidae. Now checking. | ICZN |
| Juglans | Fagales | Mabberley (2008) | Juglandaceae. | ICBN |
| Julavis | Halichondrida | Hooper (2002) | . | ICZN |
| Julbernardia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Juliomys | Rodentia | Musser & Carleton (2005) | . | ICZN |
| Jullienella | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Schizamminidae. | ICZN |
| Julostylis | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Jumellea | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Jumelleanthus | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Junceella | Alcyonacea | Bayer (1981); Bayer & Grasshoff (1994) | Ellisellidae. | ICZN |
| Junco | Passeriformes | Clements (2007) | . | ICZN |
| Juncus | Poales | Mabberley (2008) | Juncaceae. | ICBN |
| Junellia | Lamiales | Mabberley (2008) | Verbenaceae. | ICBN |
| Jungermannia | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Jungia | Arcellinida | Meisterfeld (2000) | incertae sedis. | ICZN |
| Jungia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Juniperus | Cupressales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Juratzkaea | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Juratzkaeella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Jurinea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Juruasia | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Juscelinomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Justicia | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Juttadinteria | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Juxtamesnilella | Astomatida | Lynn (2008) | . | ICZN |
| Jynx | Piciformes | Clements (2007) | . | ICZN |
| K | |
| Kabulia | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Kabuyea | Asparagales | Mabberley (2008) | Tecophilaeaceae. | ICBN |
| Kachuga | Testudinata | Vitt & Caldwell (2009) | Geomydidae. | ICZN |
| Kadarsanomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Kadenia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Kadosactis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Kadsura | Austrobaileyales | Mabberley (2008) | Schisandraceae. | ICBN |
| Kadua | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Kaempferia | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Kafirnigania | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Kageneckia | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Kahliella | Stichotrichida | Lynn (2008) | . | ICZN |
| Kahlilembus | Philasterida | Lynn (2008) | . | ICZN |
| Kahlophrya | Haptorida | Lynn (2008) | . | ICZN |
| Kailarsenia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Kairoa | Laurales | Mabberley (2008) | Monimiaceae. | ICBN |
| Kairothamnus | Malpighiales | Mabberley (2008) | Picrodendraceae. | ICBN |
| Kaistella | Flavobacteriales | Kim et al. (2004) | . | ICNB |
| Kaistia | Rhizobiales | Im et al. (2004) | . | ICNB |
| Kaisupeea | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Kajewskiella | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Kakamega | Passeriformes | Clements (2007) | . | ICZN |
| Kakoeca | Acanthoecida | Leadbeater & Thomsen (2000) | . | ICZN |
| Kalaharia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Kalakia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Kalamopsis | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Aschemocellidae. | ICZN |
| Kalanchoe | Saxifragales | Mabberley (2008) | Crassulaceae. | ICBN |
| Kalappia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Kalbreyeriella | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Kalenjinia | Chlorellales | Krienitz et al. (2012) | As Chlorellaceae. | ICBN |
| Kaliapsis | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids) Phymaraphiniidae. | ICZN |
| Kalidium | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Kalinella | | Neustupa et al. (2009) | Domain Eucarya - Phylum Chlorophyta - Class Trebouxiophyceae. Watanabea-clade. | ICBN |
| Kaliphora | Solanales | Mabberley (2008) | Montiniaceae. | ICBN |
| Kallstroemia | Zygophyllales | Mabberley (2008) | Zygophyllaceae. | ICBN |
| Kallymenia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Kallymeniopsis | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Kalmia | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Kalmiopsis | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Kalometopia | Colpodida | Lynn (2008) | . | ICZN |
| Kalophrynus | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Kaloula | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Kameginemertes | Reptantia | Kajihara et al. (2008) | . | ICZN |
| Kamelinia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Kamettia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Kampochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Kanahia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Kanaka | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Kanakysaurus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Kanaloa | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Kandaharia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Kandelia | Malpighiales | Mabberley (2008) | Rhizophoraceae. | ICBN |
| Kandleria | Erysipelotrichales | Salvetti et al. (2011) | . | ICNB |
| Kangiella | | Yoon et al. (2004) | Domain Bacteria - Phylum Proteobacteria - Class Gammaproteobacteria. | ICNB |
| Kania | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Kannabateomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Kansodinium | Peridiniales | Fensome et al. (1993) | . | ICBN |
| Kantharella | Dicyemida | Czaker (1994); Furuya et al. (2007) | . | ICZN |
| Kantiella | Laingiomedusae | Bouillon et al. (2006) | . | ICZN |
| Kaokochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Kappaphycus | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Karatavia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Karelinia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Karenia | Gymnodiniales | Daugbjerg et al. (2000) | . | ICBN |
| Karina | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Karlodinium | Gymnodiniales | Daugbjerg et al. (2000) | . | ICBN |
| Karnataka | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Karomia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Karotomorpha | Opalinales | Delvinquier & Patterson (2000); Cavalier-Smith & Chao (2006) | . | ICZN |
| Karreria | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Karreriidae. | ICZN |
| Karreriella | Textulariida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Eggerellidae. | ICZN |
| Karrerotextularia | Textulariida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Textulariidae. | ICZN |
| Karrerulina | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Prolixoplectidae. | ICZN |
| Karroochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Karsenia | Caudata | Vitt & Caldwell (2009) | Plethodontidae. | ICZN |
| Karvandarina | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Karwinskia | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Karyolysus | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Kaschgaria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Kashmiria | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Kassina | Anura | Vitt & Caldwell (2009) | Hyperoliidae. | ICZN |
| Kassinula | Anura | Vitt & Caldwell (2009) | Hyperoliidae. | ICZN |
| Katabia | | Karpov et al. (2003); Howe et al. (2009) | Domain Eucarya - Phylum Cercozoa. | ICZN |
| Katagnymene | Oscillatoriales | Hoffmann et al. (2005) | . | ICBN |
| Kataspinifera | Coccolithales | Andruleit & Young (2010) | Papposphaeraceae. | ICBN |
| Katechonemertes | Eumonostilifera | Gibson (1995); Chernyshev (2003) | . | ICZN |
| Kathablepharis | Kathablepharidida | Patterson et al. (2000); Okamoto & Inouye (2005) | "Katablepharis" is a correct spelling under ICBN. | ICZN |
| Katodinium | Gymnodiniales | Fensome et al. (1993) | . | ICBN |
| Kaufmannia | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Kaulinia | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Kaunia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Kaupifalco | Falconiformes | Clements (2007) | . | ICZN |
| Kearnemalvastrum | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Keayodendron | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Kebira | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Kebirita | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Keckiella | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Kedarnatha | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Kedrostis | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Keenania | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Keetia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Kefersteinia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Kegeliella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Keiskea | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Kelissa | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Kelleria | Malvales | Mabberley (2008) | Thymelaeaceae. | ICBN |
| Kelleromyxa | Physarales | Yamamoto (1998) | . | ICBN |
| Kelleronia | Zygophyllales | Mabberley (2008) | Zygophyllaceae. | ICBN |
| Kellicottia | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Kelloggia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Kelseya | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Kelussia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Kemulariella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Kendrickia | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Kengyilia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Kennedia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Kenopia | Passeriformes | Clements (2007) | . | ICZN |
| Kentia | Craspedida | Nitsche et al. (2011) | . | ICZN |
| Kentiopsis | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Kentmoseria | Bivalvulida | Lom & Dyková (2006) | . | ICZN |
| Kentrochona | Cryptogemmida | Lynn (2008) | . | ICZN |
| Kentrochonopsis | Cryptogemmida | Lynn (2008) | . | ICZN |
| Kentrophora | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Kentrophoros | Protostomatida | Lynn (2008) | . | ICZN |
| Kentrophyllum | Pleurostomatida | Lynn (2008) | . | ICZN |
| Kentropyx | Squamata | Vitt & Caldwell (2009) | Teiidae. | ICZN |
| Kentrothamnus | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Kephyrion | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Dinobryaceae (uniflagellate). | ICBN |
| Keppenodinium | Syndinida | Fensome et al. (1993) | . | ICZN |
| Keralica | Limnomedusae | Bouillon et al. (2006) | . | ICZN |
| Keramosphaera | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Keramosphaeridae. | ICZN |
| Keratella | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Keratoisis | Alcyonacea | Bayer (1981) | Isididae. | ICZN |
| Keraudrenia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Keraymonia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Kerianthera | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Kerilia | Squamata | Vitt & Caldwell (2009) | Serpentes. Elapidae. | ICZN |
| Keriosphaera | Mischococcales | Ettl (1978) | . | ICBN |
| Kerivoula | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Kermadecia | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Kernera | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Kerodon | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Keroeides | Alcyonacea | Bayer (1981) | Keroeididae. | ICZN |
| Kerona | Stichotrichida | Lynn (2008) | . | ICZN |
| Keronella | Urostylida | Lynn (2008) | . | ICZN |
| Keronopsis | Stichotrichida | Lynn (2008) | . | ICZN |
| Kerria | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Kerriochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Kerriodoxa | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Kerriothyrsus | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Kerstersia | Burkholderiales | Coenye et al. (2003) | . | ICNB |
| Keteleeria | Pinales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Ketogulonicigenium | Rhodobacterales | Garrity et al. (2005) | . | ICNB |
| Ketupa | Strigiformes | Clements (2007) | . | ICZN |
| Keysseria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Khadia | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Khasiaclunea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Khawkinea | Euglenales | Leedale (1967); Leedale (2000) | . | ICBN |
| Khaya | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Khmeriosicyos | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Kiaeria | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Kibara | Laurales | Mabberley (2008) | Monimiaceae. | ICBN |
| Kibaropsis | Laurales | Mabberley (2008) | Monimiaceae. | ICBN |
| Kibatalia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Kibdelosporangium | Pseudonocardiales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Kibisidytes | | Bass et al. (2009) | Domain Eucarya - Phylum Cercozoa - Class Granofilosea. | ICZN |
| Kibisidytes | Allogromiida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Lagynidae. | ICZN |
| Kickxia | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Kielmeyera | Malpighiales | Mabberley (2008) | Guttiferae. | ICBN |
| Kigelia | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Kiggelaria | Malpighiales | Mabberley (2008) | Achariaceae. | ICBN |
| Kihansia | Pandanales | Mabberley (2008) | Triuridaceae. | ICBN |
| Kiitricha | Kiitrichida | Lynn (2008) | . | ICZN |
| Kijanebalola | Chaetonotida | Balsamo et al. (2009) | . | ICZN |
| Killipia | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Kiloniella | Kiloniellales | Wiese et al. (2009) | . | ICNB |
| Kinabaluchloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Kindbergia | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Kineococcus | Kineosporiales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Kineosphaera | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Kineosporia | Kineosporiales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Kinetocodium | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Kingdonia | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Kingella | Neisseriales | Garrity et al. (2005) | . | ICNB |
| Kinghamia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Kingia | Dasypogonales | Mabberley (2008) | Dasypogonaceae. | ICBN |
| Kingianthus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Kingiodendron | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Kinixys | Testudinata | Vitt & Caldwell (2009) | Testudinidae. | ICZN |
| Kinneretia | Burkholderiales | Gomila et al. (2010) | . | ICNB |
| Kinorhynchospora | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Kinorhynchus | Homalorhagida | Higgins (1990) | . | ICZN |
| Kinosternon | Testudinata | Vitt & Caldwell (2009) | Dermatemydidae. | ICZN |
| Kintarosiphonia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Kintokiocolax | Cryptonemiales | Silva (2002); Schneider & Wynne (2007) | . | ICBN |
| Kinyongia | Squamata | Tilbury & Tolley (2009) | Chamaeleonidae. | ICZN |
| Kionophyton | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Kionotrochus | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Kipferlia | | Kolisko et al. (2010) | Domain Eucarya - Phylum Metamonada - Subphylum Trichozoa (Fornicata). | ICZN |
| Kippistia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Kirbynia | Cristamonadida | Cepicka et al. (2010) | . | ICZN |
| Kirchenpaueria | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Kirengeshoma | Cornales | Mabberley (2008) | Hydrangeaceae. | ICBN |
| Kirilowia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Kirkbridea | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Kirkia | Sapindales | Mabberley (2008) | Kirkiaceae. | ICBN |
| Kirkianella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Kirkpatrickia | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Kirsteueria | Heteronemertea | Gibson (1995) | . | ICZN |
| Kirsteueriella | Eumonostilifera | Chernyshev (2005); Kajihara et al. (2008) | Poseidonemertidae. | ICZN |
| Kishinouyea | Stauromedusae | Kramp (1961) | . | ICZN |
| Kissenia | Cornales | Mabberley (2008) | Loasaceae. | ICBN |
| Kistimonas | Oceanospirillales | Choi et al. (2010) | . | ICNB |
| Kitagawia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Kitaibela | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Kitasatospora | Streptomycetales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Kitigorchis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Kiyohimea | Lobata | Harbison & Madin (1982) | . | ICZN |
| Kjellbergiodendron | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Klaineanthus | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Klainedoxa | Malpighiales | Mabberley (2008) | Irvingiaceae. | ICBN |
| Klais | Apodiformes | Clements (2007) | . | ICZN |
| Klaprothia | Cornales | Mabberley (2008) | Loasaceae. | ICBN |
| Klarobelia | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Klasea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Klaseopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Klattia | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Klebsiella | Enterobacteriales | Garrity et al. (2005) | . | ICNB |
| Klebsiella | Euglenales | Leedale (1967); Leedale (2000) | Later homonym. Replaced by Klebsina. | ICBN |
| Klebsina | Euglenales | Leedale (1967); Leedale (2000) | Replacement name for Klebsiella. | ICBN |
| Klebsormidium | Klebsormidiales | Mikhailyuk et al. (2008) | . | ICBN |
| Kleinhovia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Kleinia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Kleioweisiopsis | Dicranales | Greuter et al. (1993); Goffinet et al. (2009) | Not "Kleioweisopsis" (Greuter et al., 1993). | ICBN |
| Klonostricha | Stichotrichida | Lynn (2008) | . | ICZN |
| Klossia | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Klossia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Klossiella | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Klosteria | Neobodonida | Nikolaev et al. (2003); Moreira et al. (2004) | . | ICZN |
| Klotzschia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Klugiella | Micrococcales | Cook et al. (2008); Ludwig et al. (2012) | . | ICNB |
| Kluyvera | Enterobacteriales | Garrity et al. (2005) | . | ICNB |
| Klyxum | Alcyonacea | Alderslade (2000) | Alcyoniidae. | ICZN |
| Knautia | Dipsacales | Mabberley (2008) | Caprifoliaceae. | ICBN |
| Kneallhazia | Microsporida | Sokolova & Fuxa (2008) | . | ICZN |
| Knema | Magnoliales | Mabberley (2008) | Myristicaceae. | ICBN |
| Kneuckeria | Porphyridiales | Schneider & Wynne (2007) | . | ICBN |
| Knightia | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Kniphofia | Asparagales | Mabberley (2008) | Asphodelaceae. | ICBN |
| Knipolegus | Passeriformes | Clements (2007) | . | ICZN |
| Knoellia | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Knopia | Alcyonacea | Alderslade & McFadden (2007) | Clavulariidae. | ICZN |
| Knoxia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Koanophyllon | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Kobresia | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Kobus | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Kochia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Kochummenia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Kocuria | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Kodalyodendron | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Koeberlinia | Brassicales | Mabberley (2008) | Koeberliniaceae. | ICBN |
| Koehneola | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Koehneria | Myrtales | Mabberley (2008) | Lythraceae. | ICBN |
| Koeleria | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Koellensteinia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Koellikeria | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Koellikerina | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Koelpinia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Koelreuteria | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Koenigia | Caryophyllales | Mabberley (2008) | Polygonaceae. | ICBN |
| Koernickanthe | Zingiberales | Mabberley (2008) | Marantaceae. | ICBN |
| Kofleria | Myxococcales | Garrity et al. (2005) | . | ICNB |
| Kofoidella | Apostomatida | Lynn (2008) | . | ICZN |
| Kofoidia | Cristamonadida | Cepicka et al. (2010) | . | ICZN |
| Kofoidina | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Kofoidinium | Noctilucales | Fensome et al. (1993) | . | ICBN |
| Kogelbergia | Lamiales | Mabberley (2008) | Stilbaceae. | ICBN |
| Kogia | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Cetacea. | ICZN |
| Kohautia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Kohleria | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Kohlrauschia | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Kohnia | Heteronemertea | Kajihara et al. (2008) | . | ICZN |
| Koilodepas | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Koinoporus | Eumonostilifera | Gibson (1995); Chernyshev (2003) | . | ICZN |
| Kokia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Kokoona | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Koliella | Chlorellales | Somogyi et al. (2011); Neustupa et al. (2011) | As Nannochloris-like clade. | ICBN |
| Koliellopsis | Prasiolales | Lokhorst et al. (2004) | Phylogenetically placed within the Prasiola clade. | ICBN |
| Kolkwitzia | Dipsacales | Mabberley (2008) | Caprifoliaceae. | ICBN |
| Kolkwitziella | Ptychodiscales | Fensome et al. (1993) | . | ICBN |
| Kolobopetalum | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Kolpophis | Squamata | Mattison (2007); Vitt & Caldwell (2009) | Serpentes. Elapidae. Not "Kolphophis. | ICZN |
| Komaroffia | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Komarovia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Komma | Pyrenomonadales | Clay et al. (1999); Novarino (2003) | . | ICBN |
| Komodomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Komokia | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Komokiidae. | ICZN |
| Komvophoron | Oscillatoriales | Hoffmann et al. (2005) | . | ICBN |
| Konothele | Euonychophora | Reid (1996) | Peripatopsidae. | ICZN |
| Kontumia | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Koompassia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Koordersiodendron | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Kophobelemnon | Pennatulacea | Williams (1995) | . | ICZN |
| Koponenia | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Kopperia | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Kopsia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Kordia | Flavobacteriales | Sohn et al. (2004) | . | ICNB |
| Kordiimonas | Kordiimonadales | Kwon et al. (2005) | . | ICNB |
| Koreibacter | Micrococcales | Lee & Lee (2010); Ludwig et al. (2012) | . | ICNB |
| Kormosia | Evaginogenida | Lynn (2008) | . | ICZN |
| Koronacantha | Echinorhynchida | Monks & Pérez-Ponce de León (1996) | Illiosentidae. | ICZN |
| Korotkevitschia | Cratenemertea | Gibson (1995); Crandall & Gibson (1998) | . | ICZN |
| Korotnevella | Dactylopodida | Smirnov et al. (2005) | . | ICZN |
| Korsaranthus | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Korshinskya | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Korthalsella | Santalales | Mabberley (2008) | Santalaceae. | ICBN |
| Korthalsia | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Koruga | Cristamonadida | Cepicka et al. (2010) | . | ICZN |
| Korupodendron | Myrtales | Mabberley (2008) | Vochysiaceae. | ICBN |
| Kosmosiphon | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Kosmotoga | Thermotogales | DiPippo et al. (2009) | . | ICNB |
| Kosopoljanskia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Kostea | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Kostermansia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Kostermanthus | Malpighiales | Mabberley (2008) | Chrysobalanaceae. | ICBN |
| Kotinia | Prorodontida | Lynn (2008) | . | ICZN |
| Kotschya | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Kovalevaia | Protostomatida | Lynn (2008) | . | ICZN |
| Kowalevskia | Appendicularia | Fenaux (1998) | Possibly spelled as "Kowalewskia". | ICZN |
| Koyamaea | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Kozakia | Rhodospirillales | Garrity et al. (2005) | . | ICNB |
| Kozloffia | Thigmotrichida | Lynn (2008) | . | ICZN |
| Kozloffiella | Rhynchodida | Lynn (2008) | . | ICZN |
| Kozlovia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Kraftia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Krameria | Zygophyllales | Mabberley (2008) | Krameriaceae. | ICBN |
| Krampella | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Krapfia | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Krapovickasia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Krascheninnikovia | Caryophyllales | Mabberley (2008) | Chenopodiaceae (or Amaranthaceae). | ICBN |
| Krasilnikovia | Micromonosporales | Ara & Kudo (2007); Ludwig et al. (2012) | . | ICNB |
| Krassniggia | Colpodida | Lynn (2008) | . | ICZN |
| Krauseola | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Kraussia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Krebsina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Polymorphinidae. | ICZN |
| Kremastochrysis | Hibberdiales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chrysocapsaceae (biflagellate). | ICBN |
| Kremastochrysopsis | Hibberdiales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chrysocapsaceae (uniflagellate). | ICBN |
| Kremeriella | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Kreodanthus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Kreyella | Cyrtolophosidida | Lynn (2008); Foissner et al. (2011) | . | ICZN |
| Kribbella | Propionibacteriales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Kribbia | Micrococcales | Jung et al. (2006); Ludwig et al. (2012) | . | ICNB |
| Kriegella | Flavobacteriales | Nedashkoskaya et al. (2008) | . | ICNB |
| Krigia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Krohnitta | Aphragmophora | Bieri (1991) | Krohnittidae. | ICZN |
| Krohnittella | Phragmophora | Bieri (1991) | Krohnittellidae. | ICZN |
| Krokinobacter | Flavobacteriales | Khan et al. (2006); Yoon et al. (2012) | Later synonym of Dokdonia. | ICNB |
| Kroppenstedtia | Bacillales | von Jan et al. (2011) | . | ICNB |
| Krubera | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Krugiodendron | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Krukoviella | Malpighiales | Mabberley (2008) | Ochnaceae. | ICBN |
| Krunodiplophyllum | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Krylovia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Kryptoperidinium | Peridiniales | Fensome et al. (1993) | . | ICBN |
| Ktedobacter | Ktedonobacterales | Cavaletti et al. (2006) | Incorrect spelling of Ktedonobacter (see Validation list no. 114). | ICNB |
| Ktedonobacter | Ktedonobacterales | Cavaletti et al. (2006) | Corrected name of "Ktedobacter". | ICNB |
| Kuarrhaphis | Baerida | Borojevic et al. (2002) | . | ICZN |
| Kubitzkia | Laurales | Mabberley (2008) | Lauraceae. | ICBN |
| Kudoa | Multivalvulida | Lom & Dyková (2006) | . | ICZN |
| Kudoacanthus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Kuehneltiella | Colpodida | Lynn (2008) | . | ICZN |
| Kuetzingia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Kuhlhasseltia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Kukenthalia | Stolidobranchia | Monniot & Monniot (1972); Monniot (2001) | Styelidae. | ICZN |
| Kuklikophrya | Platyophryida | Lynn (2008); Foissner et al. (2011) | . | ICZN |
| Kukumia | Heteronemertea | Kajihara et al. (2008) | . | ICZN |
| Kulinia | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Kuma | Acoela | Dörjes (1968); Faubel & Noreña (2001) | . | ICZN |
| Kumanoa | Batrachospermales | Wynne & Schneider (2010) | . | ICBN |
| Kummerowia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Kundmannia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Kunhardtia | Poales | Mabberley (2008) | Rapateaceae. | ICBN |
| Kunkeliella | Santalales | Mabberley (2008) | Santalaceae. | ICBN |
| Kunsia | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Kunstleria | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Kuntheria | Liliales | Mabberley (2008) | Colchicaceae. | ICBN |
| Kunzea | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Kupea | Pandanales | Mabberley (2008) | Triuridaceae. | ICBN |
| Kupeornis | Passeriformes | Clements (2007) | . | ICZN |
| Kuremsia | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992); Özdikmen (2009) | Pegidiidae. Substitute name for Sphaeridia. | ICZN |
| Kurixalus | Anura | Vitt & Caldwell (2009) | Rhacophoridae. | ICZN |
| Kurogia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Kurramiana | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Kurthia | Bacillales | Garrity et al. (2005) | . | ICNB |
| Kurzamra | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Kurzia | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Kushneria | Oceanospirillales | Sánchez-Porro et al. (2009) | . | ICNB |
| Kutchubaea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Kutzneria | Pseudonocardiales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Kvaleya | Corallinales | Schneider & Wynne (2007) | . | ICBN |
| Kyaroikeus | Dysteriida | Lynn (2008) | . | ICZN |
| Kybotion | Hibberdiales | Kristiansen & Preisig (2001) | Stylococcaceae. | ICBN |
| Kydia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Kyhosia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Kyliniella | Porphyridiales | Schneider & Wynne (2007) | . | ICBN |
| Kyllinga | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Kyllingiella | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Kymatocalyx | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Kymatolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Kyopoda | Stauromedusae | Larson (1988) | Now checking. | ICZN |
| Kyphocarpa | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Kyrpidia | Bacillales | Klenk et al. (2011) | . | ICNB |
| Kyrsteniopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Kyrtuthrix | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Kysthothigma | Thigmotrichida | Lynn (2008) | . | ICZN |
| Kytococcus | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| L | |
| Laackmanniella | Tintinnida | Lynn (2008) | . | ICZN |
| Labedaea | Pseudonocardiales | Lee (2012) | . | ICNB |
| Labedella | Micrococcales | Lee (2007); Ludwig et al. (2012) | . | ICNB |
| Labichea | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Labidognathia | Bursovaginoidea | Sørensen (2002) | . | ICZN |
| Labisia | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Lablab | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Laboea | Strombidiida | Lynn (2008) | . | ICZN |
| Labourdonnaisia | Ericales | Mabberley (2008) | Sapotaceae. | ICBN |
| Labramia | Ericales | Mabberley (2008) | Sapotaceae. | ICBN |
| Labrenzia | Rhodobacterales | Biebl et al. (2007) | . | ICNB |
| Labromonas | | Cavalier-Smith & Chao (2006) | Domain Eucarya - Kingdom Straminipila - Phylum Bicosoecacea - Class Bicoecea. | ICZN |
| Labrospira | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Haplophragmoididae. | ICZN |
| Labrys | Rhizobiales | Garrity et al. (2005) | . | ICNB |
| Laburnum | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Labyrinthocyathus | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Labyrinthula | Labyrinthulales | Dick (2001); Kirk et al. (2008) | Labyrinthulaceae. | ICBN |
| Labyrinthuloides | Thraustochytriales | Leander & Porter (2000); Dick (2001); Kirk et al. (2008) | Later synonym of Aplanochytrium. | ICBN |
| Lacaena | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Lacaitaea | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Lacazea | Stichotrichida | Lynn (2008) | . | ICZN |
| Laccodiscus | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Laccopetalum | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Laccospadix | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Laccosperma | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Lacedo | Coraciiformes | Clements (2007) | . | ICZN |
| Lacerta | Squamata | Vitt & Caldwell (2009) | Lacertidae. | ICZN |
| Lacertaspis | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Lacertoides | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Lacerus | Haptorida | Lynn (2008) | . | ICZN |
| Laceyella | Bacillales | Yoon et al. (2005) | . | ICNB |
| Lachanodes | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lachenalia | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Lachesis | Squamata | Vitt & Caldwell (2009) | Serpentes. Viperidae. | ICZN |
| Lachlanella | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Lachmannella | Astomatida | Lynn (2008) | . | ICZN |
| Lachnaea | Malvales | Mabberley (2008) | Thymelaeaceae. | ICBN |
| Lachnagrostis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lachnanthes | Commelinales | Mabberley (2008) | Haemodoraceae. | ICBN |
| Lachnoanaerobaculum | Clostridiales | Hedberg et al. (2012) | . | ICNB |
| Lachnobacterium | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Lachnobolus | Stemonitales | Lado (2001); Lado et al. (2005) | Rejected earlier synonym of Amaurochaete. | ICBN |
| Lachnocapsa | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Lachnocaulon | Poales | Mabberley (2008) | Eriocaulaceae. | ICBN |
| Lachnoloma | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Lachnophyllum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lachnorhiza | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lachnospermum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lachnospira | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Lachnostachys | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Lachnostylis | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Lacibacter | Sphingobacteriales | Qu et al. (2009) | . | ICNB |
| Lacinularia | Flosculariaceae | Segers (2002); Segers (2007) | . | ICZN |
| Lacinularoides | Flosculariaceae | Meksuwan et al. (2011) | Flosculariidae. | ICZN |
| Lacinutrix | Flavobacteriales | Bowman & Nichols (2005) | . | ICNB |
| Lacistema | Malpighiales | Mabberley (2008) | Lacistemataceae. | ICBN |
| Lackeya | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Lacmellea | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Lacroixina | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Pseudobolivinidae. | ICZN |
| Lacrymaria | Haptorida | Lynn (2008) | . | ICZN |
| Lacticigenium | Lactobacillales | Iino et al. (2009) | . | ICNB |
| Lactobacillus | Lactobacillales | Garrity et al. (2005) | . | ICNB |
| Lactococcus | Lactobacillales | Garrity et al. (2005) | . | ICNB |
| Lactonifactor | Clostridiales | Clavel et al. (2007) | . | ICNB |
| Lactoris | Piperales | Mabberley (2008) | Lactoridaceae. | ICBN |
| Lactosphaera | Lactobacillales | Garrity et al. (2005) | . | ICNB |
| Lactovum | Lactobacillales | Matthies et al. (2004) | . | ICNB |
| Lactuca | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Laculatina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ellipsolagenidae. | ICZN |
| Lacunaria | Malpighiales | Mabberley (2008) | Ochnaceae. | ICBN |
| Lacusteria | Trichomonadida | Yubuki et al. (2010) | . | ICZN |
| Lacustrinella | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hemisphaeramminidae. | ICZN |
| Ladenbergia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Ladyginia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Laelia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Laemanctus | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Laennecia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Laephotis | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Laestadia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Laetia | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Laevidentalina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Nodosariidae. | ICZN |
| Laevipeneroplis | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Peneroplidae. | ICZN |
| Lafoea | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Lafoeina | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Lafoensia | Myrtales | Mabberley (2008) | Lythraceae. | ICBN |
| Lafresnaya | Apodiformes | Clements (2007) | . | ICZN |
| Lafuentea | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Lagarosiphon | Alismatales | Mabberley (2008) | Hydrocharitaceae. | ICBN |
| Lagarosolen | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Lagarostrobos | Araucariales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Lagascea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lagena | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Lagenidae. | ICZN |
| Lagena | | Dick (2001); Kirk et al. (2008) | Domain Eucarya - Kingdom Straminipila - Phylum Oomycota. Lagenaceae. | ICBN |
| Lagenammina | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Saccamminidae. | ICZN |
| Lagenandra | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Lagenantha | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Lagenaria | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Lagenella | Euglenales | Marin et al. (2003) | Synonymous to Trachelomonas. | ICBN |
| Lagenidiopsis | | Bass et al. (2009) | Domain Eucarya - Phylum Cercozoa - Class Granofilosea. | ICZN |
| Lagenidium | Pythiales | Dick (2001); Kirk et al. (2008) | Pythiaceae. | ICBN |
| Lagenisma | Lagenismatales | Dick (2001); Kirk et al. (2008) | Lagenismataceae. | ICBN |
| Lagenocarpus | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Lagenocypsela | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lagenodelphis | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Cetacea. | ICZN |
| Lagenodifflugia | Arcellinida | Meisterfeld (2000) | Difflugina -- Difflugiidae. | ICZN |
| Lagenoeca | Craspedida | Leadbeater & Thomsen (2000); Nitsche et al. (2007) | . | ICZN |
| Lagenolingulina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Nodosariidae. | ICZN |
| Lagenophora | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lagenophrys | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Lagenorhynchus | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Cetacea. | ICZN |
| Lagenosolenia | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ellipsolagenidae. | ICZN |
| Lagenula | Euglenales | Marin et al. (2003) | Later homonym. Replaced by Lagenella. Synonymous to Trachelomonas. | ICBN |
| Lagerheimia | Chlorellales | Pažoutová et al. (2010) | As Oocystis-clade or Oocystaceae. | ICBN |
| Lagerstroemia | Myrtales | Mabberley (2008) | Lythraceae. | ICBN |
| Lagetta | Malvales | Mabberley (2008) | Thymelaeaceae. | ICBN |
| Laggera | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lagidium | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Lagnea | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ellipsolagenidae. | ICZN |
| Lagoa | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Lagochilus | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Lagoecia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Lagonosticta | Passeriformes | Clements (2007) | . | ICZN |
| Lagophylla | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lagopsis | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Lagopus | Galliformes | Clements (2007) | . | ICZN |
| Lagorchestes | Australidelphia | McKenna & Bell (1997) | . | ICZN |
| Lagostomus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Lagostrophus | Australidelphia | McKenna & Bell (1997) | . | ICZN |
| Lagothrix | Primates | McKenna & Bell (1997) | . | ICZN |
| Lagotia | Heterotrichida | Lynn (2008) | . | ICZN |
| Lagotis | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Lagrezia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Lagunaria | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Laguncula | Euglenales | Marin et al. (2003) | Synonymous to Trachelomonas. | ICBN |
| Laguncularia | Myrtales | Mabberley (2008) | Combretaceae. | ICBN |
| Lagurus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Lagurus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lagynias | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Lagynion | Hibberdiales | Kristiansen & Preisig (2001) | Stylococcaceae. | ICBN |
| Lagynis | Allogromiida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Lagynidae. | ICZN |
| Lagynophrya | Haptorida | Lynn (2008) | . | ICZN |
| Lagynurus | Haptorida | Lynn (2008) | . | ICZN |
| Lagynus | Prorodontida | Lynn (2008) | . | ICZN |
| Laingia | Laingiomedusae | Bouillon et al. (2006) | . | ICZN |
| Laingia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Lajassiella | Ichthyophonida | Kirk et al. (2008) | Eccrinales in mycology. | ICZN |
| Lalage | Passeriformes | Clements (2007) | . | ICZN |
| Laliostoma | Anura | Vitt & Caldwell (2009) | Mantellidae. | ICZN |
| Lalldhwojia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Lallemantia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Lama | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Lamanonia | Oxalidales | Mabberley (2008) | Cunoniaceae. | ICBN |
| Lamarchea | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Lamarckia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lamarckina | Robertinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ceratobuliminidae. | ICZN |
| Lambertia | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Lambornella | Tetrahymenida | Lynn (2008) | . | ICZN |
| Lamellocolea | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Lamellodysidea | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Lamellomorpha | Astrophorida | Hooper & Maldonado (2002) | . | ICZN |
| Laminononion | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Nonionidae. | ICZN |
| Laminospongia | Halichondrida | Erpenbeck & Van Soest (2002) | . | ICZN |
| Lamiodendron | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Lamiophlomis | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Lamiopsis | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Lamium | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Lamna | Lamniformes | Nelson (2006) | . | ICZN |
| Lamontia | Baerida | Borojevic et al. (2002) | . | ICZN |
| Lamottemys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Lamourouxia | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Lampadaria | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Lampas | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Lampayo | Lamiales | Mabberley (2008) | Verbenaceae. | ICBN |
| Lampea | Cydippida | Harbison & Madin (1982) | . | ICZN |
| Lampetra | Petromyzontiformes | Nelson (2006) | . | ICZN |
| Lampocteis | Lobata | Harbison et al. (2001) | . | ICZN |
| Lampophyton | Alcyonacea | Williams (2000) | Alcyoniidae. | ICZN |
| Lampornis | Apodiformes | Clements (2007) | . | ICZN |
| Lampoxanthium | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Lamprachaenium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lampranthus | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Lamprobacter | Chromatiales | Garrity et al. (2005) | . | ICNB |
| Lamprocephalus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lamprocyclas | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Lamprocyrtis | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Lamprocystis | Chromatiales | Garrity et al. (2005) | . | ICNB |
| Lamproderma | Stemonitales | Yamamoto (1998) | . | ICBN |
| Lamprolaima | Apodiformes | Clements (2007) | . | ICZN |
| Lamprolepis | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Lamprolia | Passeriformes | Clements (2007) | . | ICZN |
| Lamprolobium | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Lampromitra | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Lampronycteris | Chiroptera | Simmons (2005) | . | ICZN |
| Lampropappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lampropedia | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Lampropeltis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Lamprophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Lampropholis | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Lampropsar | Passeriformes | Clements (2007) | . | ICZN |
| Lamprospiza | Passeriformes | Clements (2007) | . | ICZN |
| Lamprothamnium | Charales | McCourt et al. (1999) | . | ICBN |
| Lamprothamnus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Lamprotornis | Passeriformes | Clements (2007) | . | ICZN |
| Lamtopyxis | Arcellinida | Meisterfeld (2000) | Difflugina -- Lamtopyxidae. | ICZN |
| Lamtoquadrula | Arcellinida | Meisterfeld (2000) | Difflugina -- Paraquadrulidae. | ICZN |
| Lamtostyla | Stichotrichida | Lynn (2008) | . | ICZN |
| Lamyropappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lamyropsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lana | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Komokiidae. | ICZN |
| Lanaria | Asparagales | Mabberley (2008) | Lanariaceae. | ICBN |
| Lanatospora | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Lancea | Lamiales | Mabberley (2008) | Phrymaceae. | ICBN |
| Landiopsis | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Landolphia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Landoltia | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Langaha | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Langebergia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Langloisia | Ericales | Mabberley (2008) | Polemoniaceae. | ICBN |
| Langsdorffia | Santalales | Mabberley (2008) | Balanophoraceae. | ICBN |
| Laniarius | Passeriformes | Clements (2007) | . | ICZN |
| Laniisoma | Passeriformes | Clements (2007) | . | ICZN |
| Lanio | Passeriformes | Clements (2007) | . | ICZN |
| Laniocera | Passeriformes | Clements (2007) | . | ICZN |
| Lanioturdus | Passeriformes | Clements (2007) | . | ICZN |
| Lanius | Passeriformes | Clements (2007) | . | ICZN |
| Lankanectes | Anura | Vitt & Caldwell (2009) | Nyctibatrachidae. | ICZN |
| Lankascincus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Lankesterella | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Lankesterella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Lankesteria | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Lankesteria | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Lannea | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Lanochordodes | Gordioidea | Schmidt-Rhaesa (2002); Poinar Jr. (2008) | . | ICZN |
| Lansium | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Lantana | Lamiales | Mabberley (2008) | Verbenaceae. | ICBN |
| Lantanopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lanthanocephalus | Alcyonacea | Williams (2000) | Alcyoniidae. | ICZN |
| Lanthanotus | Squamata | Vitt & Caldwell (2009) | Varanidae. | ICZN |
| Lanuginella | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Lanugonychia | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Lanzarana | Anura | Vitt & Caldwell (2009) | Ptychadenidae. | ICZN |
| Laocoetis | Hexactinosida | Reiswig (2002) | . | ICZN |
| Laodicea | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Laomedea | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Laosanthus | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Lapageria | Liliales | Mabberley (2008) | Philesiaceae. | ICBN |
| Lapeirousia | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Lapemis | Squamata | Vitt & Caldwell (2009) | Serpentes. Elapidae. | ICZN |
| Laphangium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lapidaria | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Lapiedra | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Lapillicoccus | Micrococcales | Lee & Lee (2007); Ludwig et al. (2012) | . | ICNB |
| Laportea | Rosales | Mabberley (2008) | Urticaceae. | ICBN |
| Lappula | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Lapsana | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lapsanastrum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Larcopyle | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Larcospira | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Lardizabala | Ranunculales | Mabberley (2008) | Lardizabalaceae. | ICBN |
| Larentia | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Laretia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Laribacter | Neisseriales | Garrity et al. (2005) | . | ICNB |
| Lariscus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Larix | Pinales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Larkinella | Cytophagales | Vancanneyt et al. (2006); Ludwig et al. (2011) | . | ICNB |
| Larnax | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Larosterna | Charadriiformes | Clements (2007) | . | ICZN |
| Larrea | Zygophyllales | Mabberley (2008) | Zygophyllaceae. | ICBN |
| Larryleachia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Larsonia | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Larssonia | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Larssoniella | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Larus | Charadriiformes | Clements (2007) | . | ICZN |
| Larutia | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Larvulina | Pleuronematida | Lynn (2008) | . | ICZN |
| Laryngosigma | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Glandulinidae. | ICZN |
| Laser | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Laserpitium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Lasia | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Lasiacis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lasiadenia | Malvales | Mabberley (2008) | Thymelaeaceae. | ICBN |
| Lasianthaea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lasianthera | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Lasianthus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Lasiarrhenum | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Lasiobema | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Lasiocarpus | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Lasiocaryum | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Lasiochlamys | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Lasiocladus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Lasiococca | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Lasiocroton | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Lasiodiscus | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Lasiolaena | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lasiomorpha | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Lasionycteris | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Lasiopetalum | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Lasiopodomys | Rodentia | Musser & Carleton (2005) | . | ICZN |
| Lasiopogon | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lasiorhinus | Australidelphia | McKenna & Bell (1997) | . | ICZN |
| Lasiospermum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lasiothalia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Lasiurus | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Lasiurus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lastarriaea | Caryophyllales | Mabberley (2008) | Polygonaceae. | ICBN |
| Lasthenia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lastreopsis | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Latania | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Latastia | Squamata | Vitt & Caldwell (2009) | Lacertidae. | ICZN |
| Latentoverneuilina | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Verneuilinidae. | ICZN |
| Laterallus | Gruiformes | Clements (2007) | . | ICZN |
| Laterocaudata | Bivalvulida | Lom & Dyková (2006) | . | ICZN |
| Lateromyxa | Aconchulinida | Bass et al. (2009) | . | ICZN |
| Lateroprotomeritus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Laterostomella | Globigerinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Chiloguembelinidae. | ICZN |
| Lathamus | Psittaciformes | Clements (2007) | . | ICZN |
| Lathraea | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Lathraeocarpa | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Lathrocasis | Ericales | Mabberley (2008) | Polemoniaceae. | ICBN |
| Lathropatus | Euonychophora | Reid (2000) | Peripatopsidae. | ICZN |
| Lathrophytum | Santalales | Mabberley (2008) | Balanophoraceae. | ICBN |
| Lathrotriccus | Passeriformes | Clements (2007) | . | ICZN |
| Lathyrus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Latibolivina | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Bolivinidae. | ICZN |
| Laticarinina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Discorbinellidae. | ICZN |
| Laticauda | Squamata | Vitt & Caldwell (2009) | Serpentes. Elapidae. | ICZN |
| Latidens | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Latifolliculina | Heterotrichida | Lynn (2008) | . | ICZN |
| Latimeria | Coelacanthiformes | Nelson (2006) | . | ICZN |
| Latispathidium | Haptorida | Lynn (2008) | . | ICZN |
| Latitiara | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Latouchea | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Latoucheornis | Passeriformes | Clements (2007) | . | ICZN |
| Latrobea | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Latrostium | Hyphochytriales | Dick (2001); Kirk et al. (2008) | Rhizidiomycetaceae. | ICBN |
| Latrunculia | Poecilosclerida | Samaai & Kelly (2002) | . | ICZN |
| Latteuria | Vestibuliferida | Lynn (2008) | . | ICZN |
| Latua | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Laubertia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Laudakia | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Launaea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Laurelia | Laurales | Mabberley (2008) | Atherospermataceae. | ICBN |
| Laureliopsis | Laurales | Mabberley (2008) | Atherospermataceae. | ICBN |
| Laurembergia | Saxifragales | Mabberley (2008) | Haloragaceae. | ICBN |
| Laurencia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Laurenciocolax | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Laurenciophila | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Laurentiella | Sporadotrichida | Lynn (2008) | . | ICZN |
| Laurentophryne | Anura | Vitt & Caldwell (2009) | Bufonidae. | ICZN |
| Laurida | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Laurophyllus | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Laurus | Laurales | Mabberley (2008) | Lauraceae. | ICBN |
| Lauterbachia | Laurales | Mabberley (2008) | Monimiaceae. | ICBN |
| Lautropia | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Lavandula | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Lavatera | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Lavia | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Lavierella | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Lavigeria | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Lavoisiera | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Lavoixia | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Lavrania | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Lawrencella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lawrencia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Lawsonia | Desulfovibrionales | Garrity et al. (2005) | . | ICNB |
| Lawsonia | Myrtales | Mabberley (2008) | Lythraceae. | ICBN |
| Laxmannia | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Laxoplumeria | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Laxotethya | Hadromerida | Sarà (2002) | . | ICZN |
| Layia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leachiella | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Leadbetterella | Cytophagales | Weon et al. (2005); Ludwig et al. (2011) | . | ICNB |
| Leandra | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Leandriella | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Learamoeba | Schizopyrenida | De Jonckheere & Brown (2005) | Junior synonym of Tetramitus. | ICZN |
| Leavenworthia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Lebeckia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Lebessphaera | Peridiniales | Meier et al. (2002) | . | ICBN |
| Lebetanthus | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Lebetimonas | Nautiliales | Takai et al. (2005) | . | ICNB |
| Leboransia | Exogenida | Lynn (2008) | . | ICZN |
| Lebronnecia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Lebrunia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Lebrunia | Malpighiales | Mabberley (2008) | Guttiferae. | ICBN |
| Lebruniodendron | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Lecananthus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Lecane | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Lecaniodiscus | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Lecanodiscus | Endogenida | Lynn (2008) | . | ICZN |
| Lecanophora | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Lecanophrya | Exogenida | Lynn (2008) | . | ICZN |
| Lecanophryella | Exogenida | Lynn (2008) | . | ICZN |
| Lecanopteris | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Lecanorchis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Lecanthus | Rosales | Mabberley (2008) | Urticaceae. | ICBN |
| Lecariocalyx | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Lechea | Malvales | Mabberley (2008) | Cistaceae. | ICBN |
| Lechevalieria | Pseudonocardiales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Lechriodus | Anura | Vitt & Caldwell (2009) | Limnodynastidae. | ICZN |
| Lechriopyla | Plagiopylida | Lynn (2008) | . | ICZN |
| Leclercia | Enterobacteriales | Garrity et al. (2005) | . | ICNB |
| Lecocarpus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lecointea | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Lecokia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Lecomtedoxa | Ericales | Mabberley (2008) | Sapotaceae. | ICBN |
| Lecomtella | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lecosia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Lecudina | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Lecythion | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Lecythis | Ericales | Mabberley (2008) | Lecythidaceae. | ICBN |
| Lecythium | Tectofilosida | Meisterfeld (2000); Cavalier-Smith & Chao (2003) | Chlamydophryidae. | ICZN |
| Ledebouria | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Ledebouriella | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Ledenbergia | Caryophyllales | Mabberley (2008) | Phytolaccaceae. | ICBN |
| Ledermanniella | Malpighiales | Mabberley (2008) | Podostemaceae. | ICBN |
| Ledothamnus | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Leea | Vitales | Mabberley (2008) | Vitaceae. | ICBN |
| Leegaardiella | Choreotrichida | Lynn (2008) | . | ICZN |
| Leeia | Neisseriales | Lim et al. (2007) | . | ICNB |
| Leersia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Leeuwenbergia | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Leeuwenhoekiella | Flavobacteriales | Nedashkovskaya et al. (2005) | . | ICNB |
| Lefebvrea | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Lefroyella | Hexactinosida | Reiswig & Wheeler (2002) | . | ICZN |
| Legatus | Passeriformes | Clements (2007) | . | ICZN |
| Legazpia | Lamiales | Mabberley (2008) | Linderniaceae. | ICBN |
| Legendrea | Haptorida | Lynn (2008) | . | ICZN |
| Legenere | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Legerella | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Legeria | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Leggadina | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Legionella | Legionellales | Garrity et al. (2005) | . | ICNB |
| Legnephora | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Legousia | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Legrandia | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Lehmanniella | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Leibleinia | Oscillatoriales | Hoffmann et al. (2005) | . | ICBN |
| Leibnitzia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leiboldia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leidesia | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Leidyana | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Leidyomyces | Ichthyophonida | Kirk et al. (2008) | Eccrinales in mycology. | ICZN |
| Leifsonia | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Leimacomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Leiocarpa | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leiocephalus | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Leiocolea | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Leiodermatium | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids) Azoricidae. | ICZN |
| Leiodontium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Leioheterodon | Squamata | Mattison (2007); Vitt & Caldwell (2009) | Serpentes. "Colubridae." Not "Lioheterodon". | ICZN |
| Leiolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Leiolepis | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Leiolopisma | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Leiomela | Bartramiales | Goffinet et al. (2009) | . | ICBN |
| Leiomitra | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Leiomitrium | Orthotrichales | Goffinet et al. (2009) | . | ICBN |
| Leiomylia | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Leionema | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Leiopathes | Antipatharia | Opresko (1998) | . | ICZN |
| Leiopelma | Anura | Vitt & Caldwell (2009) | Leiopelmatidae. | ICZN |
| Leioplegma | Aulocalycoida | Reiswig (2002) | . | ICZN |
| Leiopython | Squamata | Vitt & Caldwell (2009) | Serpentes. Pythonidae. | ICZN |
| Leiosaurus | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Leiosella | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Leiospora | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Leiosporoceros | Leiosporocerotales | Renzaglia et al. (2009) | . | ICBN |
| Leiotealia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Leiothrix | Passeriformes | Clements (2007) | . | ICZN |
| Leiothrix | Poales | Mabberley (2008) | Eriocaulaceae. | ICBN |
| Leiothylax | Malpighiales | Mabberley (2008) | Podostemaceae. | ICBN |
| Leiotrocha | Mobilida | Lynn (2008) | Later synonym of Trichodina?. | ICZN |
| Leiotulus | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Leipoa | Galliformes | Clements (2007) | . | ICZN |
| Leipokatium | Peridiniales | Fensome et al. (1993) | Holocene. | ICBN |
| Leipoldtia | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Leipsiceras | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Leishmania | Trypanosomatida | Moreira et al. (2004) | . | ICZN |
| Leisingera | Rhodobacterales | Garrity et al. (2005) | . | ICNB |
| Leitneria | Sapindales | Mabberley (2008) | Simaroubaceae. | ICBN |
| Lejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Lejolisia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Lelapia | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Lelapiella | Murrayonida | Vacelet et al. (2002) | . | ICZN |
| Lellingeria | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Lelya | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Lemanea | Batrachospermales | Schneider & Wynne (2007) | . | ICBN |
| Lembadion | Peniculida | Lynn (2008) | . | ICZN |
| Lembadionella | Philasterida | Lynn (2008) | . | ICZN |
| Lembergia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Lembidium | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Lembocarpus | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Lembophyllum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Lembotropis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Leminorella | Enterobacteriales | Garrity et al. (2005) | . | ICNB |
| Lemmaphyllum | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Lemmermanniella | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Lemmiscus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Lemmus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Lemna | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Lemnalia | Alcyonacea | Bayer (1981) | Nephtheidae. | ICZN |
| Lemniscomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Lemoorea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lemur | Primates | McKenna & Bell (1997) | . | ICZN |
| Lemurella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Lemurodendron | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Lemurophoenix | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Lemuropisum | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Lemurorchis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Lemurosicyos | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Lemyrea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Lenbrassia | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Lencymmoea | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Lendenfeldia | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Leniea | Gigartinales | Wynne & Schneider (2010) | . | ICBN |
| Lennea | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Lennoa | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Lenomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Lenophyllum | Saxifragales | Mabberley (2008) | Crassulaceae. | ICBN |
| Lenormandia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Lenormandiopsis | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Lenothrix | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Lenoxus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Lens | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Lensia | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Lentibacillus | Bacillales | Garrity et al. (2005) | . | ICNB |
| Lentibacter | Rhodospirillales | Li et al. (2012) | . | ICNB |
| Lenticulina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Vaginulinidae. | ICZN |
| Lentisphaera | Lentisphaerales | Cho et al. (2004) | . | ICNB |
| Lentzea | Pseudonocardiales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Lenwebbia | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Lenzia | Caryophyllales | Mabberley (2008) | Portulacaceae. | ICBN |
| Leocarpus | Physarales | Yamamoto (1998) | . | ICBN |
| Leocereus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Leochilus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Leocus | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Leonardoxa | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Leonia | Malpighiales | Mabberley (2008) | Violaceae. | ICBN |
| Leonis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leonotis | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Leontice | Ranunculales | Mabberley (2008) | Berberidaceae. | ICBN |
| Leontochir | Liliales | Mabberley (2008) | Alstroemeriaceae. | ICBN |
| Leontodon | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leontopithecus | Primates | McKenna & Bell (1997) | . | ICZN |
| Leontopodium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leonurus | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Leopardus | Carnivora | Wozencraft (2005) | . | ICZN |
| Leopoldamys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Leopoldinia | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Lepactis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Lepadella | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Lepanthes | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Lepanthopsis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Lepechinia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Lepechiniella | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Lepeostegeres | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Lepicolea | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Lepidagathis | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Lepidaploa | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lepidaria | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Lepiderema | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Lepidesmia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lepidisis | Alcyonacea | Bayer (1981) | Isididae. | ICZN |
| Lepidium | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Lepidobatrachus | Anura | Vitt & Caldwell (2009) | Ceratophryidae. | ICZN |
| Lepidoblepharis | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Lepidobolus | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Lepidobotrys | Celastrales | Mabberley (2008) | Lepidobotryaceae. | ICBN |
| Lepidocaryum | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Lepidoceras | Santalales | Mabberley (2008) | Santalaceae. | ICBN |
| Lepidochaetus | Chaetonotida | Balsamo et al. (2009) | Junior synonym of Chaetonotus. | ICZN |
| Lepidochelys | Testudinata | Vitt & Caldwell (2009) | Cheloniidae. | ICZN |
| Lepidochrysis | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chromulinaceae (biflagellate). | ICBN |
| Lepidocolaptes | Passeriformes | Clements (2007) | . | ICZN |
| Lepidocordia | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Lepidodactylus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Lepidodasys | Macrodasyida | Hummon & Todaro (2010) | . | ICZN |
| Lepidoderma | Physarales | Yamamoto (1998) | . | ICBN |
| Lepidodermella | Chaetonotida | Balsamo et al. (2009); Hummon & Todaro (2010) | . | ICZN |
| Lepidodeuterammina | Trochamminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Trochamminidae. | ICZN |
| Lepidodinium | Gymnodiniales | Fensome et al. (1993) | . | ICBN |
| Lepidogyna | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Lepidogyne | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Lepidolaena | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Lepidolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Lepidoleucon | Baerida | Borojevic et al. (2002) | . | ICZN |
| Lepidolopha | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lepidolopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lepidomicrosorium | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Lepidomuricea | Alcyonacea | Bayer (1981) | Plexauridae. | ICZN |
| Lepidonia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lepidoparatrochammina | Trochamminida | Kaminski (2000) | Trochammininae, Trochamminacea. | ICZN |
| Lepidopetalum | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Lepidophorum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lepidophyllum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lepidophyma | Squamata | Vitt & Caldwell (2009) | Xantusiidae. | ICZN |
| Lepidopilidium | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Lepidopilum | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Lepidopora | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Lepidopyga | Apodiformes | Clements (2007) | . | ICZN |
| Lepidorrhachis | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Lepidosiren | Ceratodontiformes | Nelson (2006) | . | ICZN |
| Lepidospartum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lepidosperma | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Lepidosphaera | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Lepidostemon | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Lepidostephium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lepidostoma | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Lepidothamnus | Araucariales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Lepidotheca | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Lepidothrix | Passeriformes | Clements (2007) | . | ICZN |
| Lepidotrachelophyllum | Haptorida | Lynn (2008) | . | ICZN |
| Lepidotrichilia | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Lepidozamia | Cycadales | Mabberley (2008); Christenhusz et al. (2011) | . | ICBN |
| Lepidozia | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Lepilaena | Alismatales | Mabberley (2008) | Potamogetonaceae. | ICBN |
| Lepilemur | Primates | McKenna & Bell (1997) | . | ICZN |
| Lepinia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Lepiniopsis | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Lepionurus | Santalales | Mabberley (2008) | Opiliaceae. | ICBN |
| Lepironia | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Lepisanthes | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Lepismatophila | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Lepismium | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Lepisorus | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Lepistemon | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Lepistemonopsis | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Lepoarctus | Arthrotardigrada | Kinchin (1994) | . | ICZN |
| Lepochromulina | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Dinobryaceae (uniflagellate). | ICBN |
| Lepocinclis | Euglenales | Leedale (1967); Leedale (2000); Marin et al. (2003) | . | ICBN |
| Leporella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Leporillus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Leposoma | Squamata | Vitt & Caldwell (2009) | Gymnophthalmidae. | ICZN |
| Leposternon | Squamata | Vitt & Caldwell (2009) | Amphisbaenidae. | ICZN |
| Leprotintinnus | Tintinnida | Lynn (2008) | . | ICZN |
| Leptactina | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Leptadenia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Leptagrostis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Leptailurus | Carnivora | Wozencraft (2005) | . | ICZN |
| Leptaleum | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Leptammina | Astrorhizida | Cedhagen et al. (2009) | . | ICZN |
| Leptarrhena | Saxifragales | Mabberley (2008) | Saxifragaceae. | ICBN |
| Leptaspis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Leptasthenura | Passeriformes | Clements (2007) | . | ICZN |
| Leptastrea | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Leptaulus | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Leptecophylla | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Leptinella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leptoamphisiella | Urostylida | Li et al. (2007) | . | ICZN |
| Leptobacterium | Flavobacteriales | Mitra et al. (2009) | . | ICNB |
| Leptobarbula | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Leptoboea | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Leptobrachella | Anura | Vitt & Caldwell (2009) | Megophryidae. | ICZN |
| Leptobrachia | Rhizostomeae | Kramp (1961) | . | ICZN |
| Leptobrachium | Anura | Vitt & Caldwell (2009) | Megophryidae. | ICZN |
| Leptobryum | Splachnales | Goffinet et al. (2009) | . | ICBN |
| Leptocarpha | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leptocarpus | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Leptocarydion | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Leptoceras | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Leptocereus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Leptocharias | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Leptochilus | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Leptochiton | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Leptochlamys | Arcellinida | Meisterfeld (2000) | Difflugina -- Hyalospheniidae. | ICZN |
| Leptochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Leptocladia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Leptocladiella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Leptocladium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Leptoclinides | Aplousobranchia | Monniot & Monniot (1972); Monniot (2001) | Didemnidae. | ICZN |
| Leptoclinium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leptocoma | Passeriformes | Clements (2007) | . | ICZN |
| Leptodactylodon | Anura | Vitt & Caldwell (2009) | Arthroleptidae. | ICZN |
| Leptodactylus | Anura | Vitt & Caldwell (2009) | Leptodactylidae. | ICZN |
| Leptodeira | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Leptoderma | Stemonitales | Yamamoto (1998) | . | ICBN |
| Leptodermis | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Leptoderris | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Leptodesmia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Leptodictyum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Leptodiscus | Noctilucales | Fensome et al. (1993) | . | ICBN |
| Leptodon | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Leptodon | Falconiformes | Clements (2007) | . | ICZN |
| Leptodontiella | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Leptodontium | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Leptodrymus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Leptofauchea | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Leptoglossis | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Leptogonum | Caryophyllales | Mabberley (2008) | Polygonaceae. | ICBN |
| Leptogorgia | Alcyonacea | Bayer (1981) | Gorgoniidae. | ICZN |
| Leptohalysis | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hormosinidae. | ICZN |
| Leptohymenium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Leptoischyrodon | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Leptoklonion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Leptolaena | Malvales | Mabberley (2008) | Sarcolaenaceae. | ICBN |
| Leptolalax | Anura | Vitt & Caldwell (2009) | Megophryidae. | ICZN |
| Leptolegnia | Saprolegniales | Dick (2001); Kirk et al. (2008) | Leptolegniaceae. | ICBN |
| Leptolegniella | Leptomitales | Dick (2001); Kirk et al. (2008) | Leptolegniellaceae. | ICBN |
| Leptolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Leptolepia | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Leptolinea | Anaerolineales | Yamada et al. (2006) | . | ICNB |
| Leptolyngbya | Pseudanabaenales | Hoffmann et al. (2005) | . | ICBN |
| Leptomeria | Santalales | Mabberley (2008) | Santalaceae. | ICBN |
| Leptomischus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Leptomitus | Leptomitales | Dick (2001); Kirk et al. (2008) | Leptomitaceae. | ICBN |
| Leptomonas | Trypanosomatida | Moreira et al. (2004) | . | ICZN |
| Leptomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Leptomyxa | Leptomyxida | Rogerson & Patterson (2000); Smirnov et al. (2005) | . | ICZN |
| Leptonema | Spirochaetales | Garrity et al. (2005) | . | ICNB |
| Leptonema | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Leptonemertes | Eumonostilifera | Gibson (1995); Chernyshev (2003) | . | ICZN |
| Leptonychia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Leptonychotes | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Leptonycteris | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Leptopelis | Anura | Vitt & Caldwell (2009) | Arthroleptidae. | ICZN |
| Leptopenus | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Leptopharynx | Microthoracida | Lynn (2008) | . | ICZN |
| Leptophascum | Pottiales | Werner et al. (2004) | . | ICBN |
| Leptophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Leptophryne | Anura | Vitt & Caldwell (2009) | Bufonidae. | ICZN |
| Leptophyllis | Bonnemaisoniales | Schneider & Wynne (2007) | . | ICBN |
| Leptophyllopsis | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Leptophytum | Corallinales | Schneider & Wynne (2007) | Later synonym of Phymatolithon. | ICBN |
| Leptopoecile | Passeriformes | Clements (2007) | . | ICZN |
| Leptopogon | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Leptopogon | Passeriformes | Clements (2007) | . | ICZN |
| Leptopsammia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Leptopterigynandrum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Leptopteris | Osmundales | Christenhusz et al. (2011) | . | ICBN |
| Leptopterus | Passeriformes | Clements (2007) | . | ICZN |
| Leptoptilos | Ciconiiformes | Clements (2007) | . | ICZN |
| Leptopus | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Leptopyrum | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Leptorhabdos | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Leptorhynchoides | Echinorhynchida | Amin (1985) | . | ICZN |
| Leptorhynchos | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leptoria | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Leptorumohra | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Leptosagitta | Aphragmophora | Kasatkina (1973); Kasatkina & Selivanova (2003) | Sagittidae. Now checking. | ICZN |
| Leptosastra | Hadromerida | Hooper (2002) | . | ICZN |
| Leptoscela | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Leptoscyphopsis | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Leptoscyphus | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Leptosema | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Leptoseps | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Leptoseris | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Leptosiaphos | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Leptosiphonia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Leptosiphonium | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Leptosira | | Neustupa et al. (2011) | Domain Eucarya - Phylum Chlorophyta - Class Trebouxiophyceae. | ICBN |
| Leptosittaca | Psittaciformes | Clements (2007) | . | ICZN |
| Leptosolena | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Leptosomia | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Leptosomus | Coraciiformes | Clements (2007) | . | ICZN |
| Leptospermum | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Leptospira | Spirochaetales | Garrity et al. (2005) | . | ICNB |
| Leptospirillum | Nitrospirales | Garrity et al. (2005) | . | ICNB |
| Leptospironympha | Trichonymphida | Cepicka et al. (2010) | . | ICZN |
| Leptostelma | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leptostigma | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Leptostomopsis | Bryales | Goffinet et al. (2009) | . | ICBN |
| Leptostomum | Bryales | Goffinet et al. (2009) | . | ICBN |
| Leptostylis | Ericales | Mabberley (2008) | Sapotaceae. | ICBN |
| Leptoterantha | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Leptotes | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Leptotheca | Orthodontiales | Stech & Frey (2008); Goffinet et al. (2009) | . | ICBN |
| Leptotheca | Bivalvulida | Lom & Dyková (2006) | . | ICZN |
| Leptothrium | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Leptothrix | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Leptothyrsa | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Leptotila | Columbiformes | Clements (2007) | . | ICZN |
| Leptotriche | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leptotrichella | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Leptotrichia | Fusobacteriales | Garrity et al. (2005) | . | ICNB |
| Leptotyphlops | Squamata | Vitt & Caldwell (2009) | Serpentes. Leptotyphlopidae. | ICZN |
| Lepturidium | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lepturopetium | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lepturophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Lepturus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lepuropetalon | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Lepus | Lagomorpha | McKenna & Bell (1997) | . | ICZN |
| Lepyrodia | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Lepyrodiclis | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Lepyrodon | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Lepyrodontopsis | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Leratia | Orthotrichales | Goffinet et al. (2009) | . | ICBN |
| Lerchea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Lereschia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Leretia | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Lerista | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Lernella | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cassidulinidae. | ICZN |
| Lerwa | Galliformes | Clements (2007) | . | ICZN |
| Lesbia | Apodiformes | Clements (2007) | . | ICZN |
| Lescaillea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leschenaultia | Asterales | Mabberley (2008) | Goodeniaceae. | ICBN |
| Lescuraea | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Leskea | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Leskeadelphus | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Leskeella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Leskeodon | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Leskeodontopsis | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Lesleigha | Sebdeniales | Kraft & Saunders (2011) | . | ICBN |
| Lesliea | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Lespedeza | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Lesquerella | | Meisterfeld (2000); Cavalier-Smith & Chao (2003) | Domain Eucarya - Phylum Cercozoa. | ICZN |
| Lesquereusia | Arcellinida | Meisterfeld (2000) | Difflugina -- Lesquereusiidae. | ICZN |
| Lesquereuxia | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Lessardia | Peridiniales | Saldarriaga et al. (2003) | . | ICBN |
| Lessertia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Lessingia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lessingianthus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lessonia | Passeriformes | Clements (2007) | . | ICZN |
| Lestodelphys | Ameridelphia | McKenna & Bell (1997) | . | ICZN |
| Lestoros | Ameridelphia | McKenna & Bell (1997) | . | ICZN |
| Lesueuria | Corallinales | Schneider & Wynne (2007) | . | ICBN |
| Letepsammia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Letestua | Ericales | Mabberley (2008) | Sapotaceae. | ICBN |
| Letestudoxa | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Letestuella | Malpighiales | Mabberley (2008) | Podostemaceae. | ICBN |
| Letestuinema | Nostocales | Yamagishi (2007) | . | ICBN |
| Lethedon | Malvales | Mabberley (2008) | Thymelaeaceae. | ICBN |
| Lethenteron | Petromyzontiformes | Nelson (2006) | . | ICZN |
| Lethocolea | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Lettowianthus | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Leucactinia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leucadendron | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Leucaena | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Leucaltis | Clathrinida | Borojevic et al. (2002) | . | ICZN |
| Leucandra | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Leucandrilla | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Leucanthemella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leucanthemopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leucanthemum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leucas | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Leucascandra | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Leucascus | Clathrinida | Borojevic et al. (2002) | . | ICZN |
| Leucaster | Caryophyllales | Mabberley (2008) | Nyctaginaceae. | ICBN |
| Leucetta | Clathrinida | Borojevic et al. (2002) | . | ICZN |
| Leucettaga | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Leucettusa | Clathrinida | Borojevic et al. (2002) | . | ICZN |
| Leucheria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leuchtenbergia | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Leucilla | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Leucippus | Apodiformes | Clements (2007) | . | ICZN |
| Leuciva | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leuckartiara | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Leuclathrina | Clathrinida | Borojevic et al. (2002) | . | ICZN |
| Leucobacter | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Leucoblepharis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leucobryum | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Leucocarpus | Lamiales | Mabberley (2008) | Phrymaceae. | ICBN |
| Leucocephalon | Testudinata | Vitt & Caldwell (2009) | Geomydidae. | ICZN |
| Leucocephalonemertes | Heteronemertea | Kajihara et al. (2008) | . | ICZN |
| Leucochloris | Apodiformes | Clements (2007) | . | ICZN |
| Leucochloron | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Leucochrysum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leucocodon | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Leucocoryne | Asparagales | Mabberley (2008) | Alliaceae. | ICBN |
| Leucocrinum | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Leucocroton | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Leucocryptos | Kathablepharidida | Patterson et al. (2000); Okamoto & Inouye (2005) | . | ICZN |
| Leucocyclus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leucocytozoon | Haemospororida | Perkins et al. (2000) | . | ICZN |
| Leucodictyon | Leucodictyida | Cavalier-Smith & Chao (2003) | . | ICZN |
| Leucodon | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Leucogenes | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leucohyle | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Leucojum | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Leucolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Leucolepis | Bryales | Goffinet et al. (2009) | . | ICBN |
| Leucoloma | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Leucomalthe | Clathrinida | Borojevic et al. (2002) | . | ICZN |
| Leucomium | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Leucomphalos | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Leuconia | Baerida | Borojevic et al. (2002) | . | ICZN |
| Leuconostoc | Lactobacillales | Garrity et al. (2005) | . | ICNB |
| Leuconotis | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Leucoperichaetium | Grimmiales | Goffinet et al. (2009) | . | ICBN |
| Leucopeza | Passeriformes | Clements (2007) | . | ICZN |
| Leucophanes | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Leucophrys | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Leucophyllum | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Leucophysalis | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Leucophyta | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leucopoa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Leucopogon | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Leucopsacus | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Leucopsar | Passeriformes | Clements (2007) | . | ICZN |
| Leucopsila | Baerida | Borojevic et al. (2002) | . | ICZN |
| Leucoptera | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leucopternis | Falconiformes | Clements (2007) | . | ICZN |
| Leucoraja | Rajiformes | Nelson (2006) | . | ICZN |
| Leucosalpa | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Leucosarcia | Columbiformes | Clements (2007) | . | ICZN |
| Leucosceptrum | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Leucosidea | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Leucosolenia | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Leucospermum | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Leucosphaera | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Leucospora | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Leucostegane | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Leucostegia | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Leucosticte | Passeriformes | Clements (2007) | . | ICZN |
| Leucosyke | Rosales | Mabberley (2008) | Urticaceae. | ICBN |
| Leucothea | Lobata | Harbison & Madin (1982) | . | ICZN |
| Leucothoe | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Leucothrix | Thiotrichales | Garrity et al. (2005) | . | ICNB |
| Leucotrichum | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Leucyssa | Baerida | Borojevic et al. (2002) | . | ICZN |
| Leukapsis | Chromulinales | Kristiansen & Preisig (2001) | Chrysamoebaceae (no flagellate stage). | ICBN |
| Leukarachnion | | Grant et al. (2009) | Domain Eucarya - Kingdom Straminipila - Phylum Ochrophyta - Synchromophyceae. | ICBN |
| Leukochrysis | Chromulinales | Kristiansen & Preisig (2001) | Chrysamoebaceae (no flagellate stage). | ICBN |
| Leunisia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Leuropezos | Euonychophora | Reid (1996) | Peripatopsidae. | ICZN |
| Leutea | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Levanderella | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Leveillea | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Levenhookia | Asterales | Mabberley (2008) | Stylidiaceae. | ICBN |
| Levicoleps | Prorodontida | Foissner et al. (2008) | Colepidae. | ICZN |
| Levierella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Levieria | Laurales | Mabberley (2008) | Monimiaceae. | ICBN |
| Levilinea | Anaerolineales | Yamada et al. (2006) | . | ICNB |
| Levinea | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Levinella | Clathrinida | Borojevic et al. (2002) | . | ICZN |
| Levisticum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Levringiella | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Lewinella | Sphingobacteriales | Garrity et al. (2005) | . | ICNB |
| Lewinia | Gruiformes | Clements (2007) | . | ICZN |
| Lewisia | Caryophyllales | Mabberley (2008) | Portulacaceae. | ICBN |
| Leycesteria | Dipsacales | Mabberley (2008) | Caprifoliaceae. | ICBN |
| Leymus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Leysera | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Liabum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Liagora | Nemaliales | Schneider & Wynne (2007) | . | ICBN |
| Liagoropsis | Nemaliales | Schneider & Wynne (2007) | . | ICBN |
| Liagorothamnion | Bonnemaisoniales | Schneider & Wynne (2007) | . | ICBN |
| Lialis | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Liasis | Squamata | Vitt & Caldwell (2009) | Serpentes. Pythonidae. | ICZN |
| Liatris | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Liberiictis | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Libertia | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Libidibia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Libocedrus | Cupressales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Librevillea | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Libyella | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Licania | Malpighiales | Mabberley (2008) | Chrysobalanaceae. | ICBN |
| Licaria | Laurales | Mabberley (2008) | Lauraceae. | ICBN |
| Licea | Liceales | Yamamoto (1998) | . | ICBN |
| Lichenostomus | Passeriformes | Clements (2007) | . | ICZN |
| Lichmera | Passeriformes | Clements (2007) | . | ICZN |
| Lichonycteris | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Lichtensteinia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Licnophora | Licnophorida | Lynn (2008) | . | ICZN |
| Licuala | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Lidbeckia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lieberkuehnia | Allogromiida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Allogromiidae. | ICZN |
| Liebusella | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Globotextulariidae. | ICZN |
| Lifago | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Ligaria | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Ligeophila | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Ligiarctus | Arthrotardigrada | Kinchin (1994) | . | ICZN |
| Lignella | Alcyonacea | Bayer (1981) | Keroeididae. | ICZN |
| Ligniera | Plasmodiophorida | Cavalier-Smith (1993); Kirk et al. (2008) | . | ICZN |
| Lignopsis | Alcyonacea | Pérez & Zamponi (2000) | Briareidae. | ICZN |
| Ligularia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Ligulariopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Ligusticopsis | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Ligusticum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Ligustrum | Lamiales | Mabberley (2008) | Oleaceae. | ICBN |
| Lijndenia | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Lilaea | Alismatales | Mabberley (2008) | Juncaginaceae. | ICBN |
| Lilaeopsis | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Liliimorpha | Haptorida | Lynn (2008) | . | ICZN |
| Lilium | Liliales | Mabberley (2008) | Liliaceae. | ICBN |
| Lillipathes | Antipatharia | Opresko (2002) | . | ICZN |
| Lilyopsis | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Limacia | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Limaciopsis | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Limbarda | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Limbella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Limeum | Caryophyllales | Mabberley (2008) | Limeaceae. | ICBN |
| Limibacter | Cytophagales | Yoon et al. (2008); Ludwig et al. (2011) | . | ICNB |
| Limicola | Charadriiformes | Clements (2007) | . | ICZN |
| Limmenius | Apochela | Kinchin (1994) | . | ICZN |
| Limnactinia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Limnanthes | Brassicales | Mabberley (2008) | Limnanthaceae. | ICBN |
| Limnas | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Limnemertes | Eumonostilifera | Chernyshev (2005); Kajihara et al. (2008) | Prostomatidae. | ICZN |
| Limnias | Flosculariaceae | Segers (2002); Segers (2007) | . | ICZN |
| Limnobacter | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Limnobium | Alismatales | Mabberley (2008) | Hydrocharitaceae. | ICBN |
| Limnocharis | Alismatales | Mabberley (2008) | Alismataceae. | ICBN |
| Limnocnida | Limnomedusae | Bouillon et al. (2006) | . | ICZN |
| Limnococcus | Chroococcales | Komárková et al. (2010) | . | ICBN |
| Limnodea | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Limnodromus | Charadriiformes | Clements (2007) | . | ICZN |
| Limnodynastes | Anura | Vitt & Caldwell (2009) | Limnodynastidae. | ICZN |
| Limnofila | Limnofilida | Bass et al. (2009) | . | ICZN |
| Limnogale | Afrosoricida | McKenna & Bell (1997); Stanhope et al. (1998) | Tenrecidae. | ICZN |
| Limnognathia | Limnognathida | Kristensen & Funch (2000) | . | ICZN |
| Limnohabitans | Burkholderiales | Hahn et al. (2010) | . | ICNB |
| Limnomedusa | Anura | Vitt & Caldwell (2009) | Cycloramphidae. | ICZN |
| Limnomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Limnonectes | Anura | Vitt & Caldwell (2009) | Dicroglossidae. | ICZN |
| Limnophila | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Limnophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Limnophrys | Anura | Vitt & Caldwell (2009) | Brachycephalidae. | ICZN |
| Limnophyton | Alismatales | Mabberley (2008) | Alismataceae. | ICBN |
| Limnopoa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Limnoposthia | Acoela | Faubel & Kolasa (1978) | Under confirmation. | ICZN |
| Limnoricus | Exogenida | Lynn (2008) | . | ICZN |
| Limnornis | Passeriformes | Clements (2007) | . | ICZN |
| Limnosciadium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Limnosipanea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Limnostrombidium | Strombidiida | Lynn (2008) | . | ICZN |
| Limnothlypis | Passeriformes | Clements (2007) | . | ICZN |
| Limnothrix | Pseudanabaenales | Hoffmann et al. (2005) | . | ICBN |
| Limodorum | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Limonia | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Limoniastrum | Caryophyllales | Mabberley (2008) | Plumbaginaceae. | ICBN |
| Limoniopsis | Caryophyllales | Mabberley (2008) | Plumbaginaceae. | ICBN |
| Limonium | Caryophyllales | Mabberley (2008) | Plumbaginaceae. | ICBN |
| Limosa | Charadriiformes | Clements (2007) | . | ICZN |
| Limosella | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Limprichtia | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Linantha | Coronatae | Kramp (1961) | . | ICZN |
| Linanthus | Ericales | Mabberley (2008) | Polemoniaceae. | ICBN |
| Linaria | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Linariantha | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Linariopsis | Lamiales | Mabberley (2008) | Pedaliaceae. | ICBN |
| Linconia | Bruniales | Mabberley (2008) | Bruniaceae. | ICBN |
| Lindackeria | Malpighiales | Mabberley (2008) | Achariaceae. | ICBN |
| Lindbergella | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lindbergia | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Lindbladia | Liceales | Yamamoto (1998) | . | ICBN |
| Lindelofia | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Lindenbergia | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Lindenia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Lindera | Laurales | Mabberley (2008) | Lauraceae. | ICBN |
| Lindernia | Lamiales | Mabberley (2008) | Linderniaceae. | ICBN |
| Lindheimera | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lindia | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Lindigia | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Lindigianthus | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Lindleya | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Lindmania | Poales | Mabberley (2008) | Bromeliaceae. | ICBN |
| Lindsaea | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Lindsayomyrtus | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Linea | Astrorhizida | Kaminski (2000) | Rhabdammininae. | ICZN |
| Lineolaria | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Lineopsella | Heteronemertea | Gibson (1995) | . | ICZN |
| Lineopselloides | Heteronemertea | Gibson (1995) | . | ICZN |
| Lineopsis | Heteronemertea | Gibson (1995) | . | ICZN |
| Lineus | Heteronemertea | Gibson (1995) | . | ICZN |
| Lingelsheimia | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Lingulamoeba | Vannellida | Smirnov et al. (2005) | . | ICZN |
| Lingulina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Nodosariidae. | ICZN |
| Lingulodinium | Gonyaulacales | Fensome et al. (1993) | . | ICBN |
| Lingulosigmomorphina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Polymorphinidae. | ICZN |
| Linnaea | Dipsacales | Mabberley (2008) | Caprifoliaceae. | ICBN |
| Linodendron | Malvales | Mabberley (2008) | Thymelaeaceae. | ICBN |
| Linospadix | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Linostoma | Malvales | Mabberley (2008) | Thymelaeaceae. | ICBN |
| Linostomella | Heterotrichida | Lynn (2008) | . | ICZN |
| Lintonia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Linuche | Coronatae | Kramp (1961) | . | ICZN |
| Linum | Malpighiales | Mabberley (2008) | Linaceae. | ICBN |
| Linurgus | Passeriformes | Clements (2007) | . | ICZN |
| Liochlaena | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Liochlorophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Liocichla | Passeriformes | Clements (2007) | . | ICZN |
| Lioheterophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Liolaemus | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Liomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Lionycteris | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Liopeltis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Liophidium | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Liophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Liopholidophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Liophryne | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Lioptilus | Passeriformes | Clements (2007) | . | ICZN |
| Liosceles | Passeriformes | Clements (2007) | . | ICZN |
| Lioscincus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Liosina | Halichondrida | Van Soest et al. (2002) | . | ICZN |
| Liotyphlops | Squamata | Vitt & Caldwell (2009) | Serpentes. Anomalepididae. | ICZN |
| Liparia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Liparis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Liparophyllum | Asterales | Mabberley (2008) | Menyanthaceae. | ICBN |
| Lipastrotethya | Halichondrida | Van Soest et al. (2002) | . | ICZN |
| Lipaugus | Passeriformes | Clements (2007) | . | ICZN |
| Lipinia | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Lipkea | Stauromedusae | Kramp (1961) | . | ICZN |
| Lipmanella | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Lipocarpha | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Lipochaeta | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lipocystis | Neogregarinorida | Perkins et al. (2000) | . | ICZN |
| Liponema | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Liposcelisus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Lipotes | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Cetacea. | ICZN |
| Lipotropha | Neogregarinorida | Perkins et al. (2000) | . | ICZN |
| Lippia | Lamiales | Mabberley (2008) | Verbenaceae. | ICBN |
| Lipschitziella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lipskya | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Liquidambar | Saxifragales | Mabberley (2008) | Hamamelidaceae. | ICBN |
| Lirella | Phaeogromida | Takahashi & Anderson (2000) | . | ICZN |
| Liriodendron | Magnoliales | Mabberley (2008) | Magnoliaceae. | ICBN |
| Liriope | Trachymedusae | Bouillon et al. (2006) | . | ICZN |
| Liriope | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Liriospyris | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Lisaea | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Lishizhenia | Flavobacteriales | Lau et al. (2006) | . | ICNB |
| Lisianthus | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Lissaiella | Ptychodiscales | Fensome et al. (1993) | . | ICBN |
| Lissanthe | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Lissemys | Testudinata | Vitt & Caldwell (2009) | Trionychidae. | ICZN |
| Lissocarpa | Ericales | Mabberley (2008) | Ebenaceae. | ICBN |
| Lissoclinum | Aplousobranchia | Monniot & Monniot (1972); Monniot (2001) | Didemnidae. | ICZN |
| Lissodelphis | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Cetacea. | ICZN |
| Lissodendoryx | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Lissodinium | Peridiniales | Fensome et al. (1993) | . | ICBN |
| Lissonycteris | Chiroptera | Simmons (2005) | . | ICZN |
| Lissostrombidium | Strombidiida | Lynn (2008) | . | ICZN |
| Lissotis | Gruiformes | Clements (2007) | . | ICZN |
| Lissotriton | Caudata | Vitt & Caldwell (2009) | Salamandridae. | ICZN |
| Listarcon | Endogenida | Lynn (2008) | . | ICZN |
| Listerella | Liceales | Yamamoto (1998) | . | ICBN |
| Listeria | Bacillales | Garrity et al. (2005) | . | ICNB |
| Listonella | Vibrionales | Garrity et al. (2005); Thompson et al. (2011) | Later synonym of Vibrio. | ICNB |
| Listrostachys | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Litchi | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Lithachne | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Litharachnium | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Lithelius | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Lithobactrum | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids) Siphonidiidae. | ICZN |
| Lithobates | Anura | Vitt & Caldwell (2009) | Ranidae. | ICZN |
| Lithobium | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Lithocapsa | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Lithocarpus | Fagales | Mabberley (2008) | Fagaceae. | ICBN |
| Lithochela | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Lithocircus | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Lithococcus | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Lithocystis | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Lithodora | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Lithodraba | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Lithomyrtus | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Lithomyxa | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Lithopera | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Lithophila | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Lithophragma | Saxifragales | Mabberley (2008) | Saxifragaceae. | ICBN |
| Lithophyllon | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Lithophyllum | Corallinales | Schneider & Wynne (2007) | . | ICBN |
| Lithoplocamia | Poecilosclerida | Hooper (2002) | . | ICZN |
| Lithoporella | Corallinales | Schneider & Wynne (2007) | . | ICBN |
| Lithops | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Lithoptera | Arthracanthida | Febvre et al. (2000) | . | ICZN |
| Lithospermum | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Lithostegia | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Lithostrobus | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Lithothamnion | Corallinales | Schneider & Wynne (2007) | . | ICBN |
| Lithothrix | Corallinales | Schneider & Wynne (2007) | . | ICBN |
| Lithraea | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Litocranius | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Litogyne | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Litonotus | Pleurostomatida | Lynn (2008) | . | ICZN |
| Litophyton | Alcyonacea | Bayer (1981) | Nephtheidae. | ICZN |
| Litoreibacter | Rhodobacterales | Romanenko et al. (2011) | . | ICNB |
| Litoria | Anura | Vitt & Caldwell (2009) | Hylidae. | ICZN |
| Litoribacter | Cytophagales | Tian et al. (2010) | . | ICNB |
| Litoricola | Oceanospirillales | Kim et al. (2007) | . | ICNB |
| Litorimicrobium | Rhodobacterales | Jin et al. (2011) | . | ICNB |
| Litorimonas | | Jung et al. (2011) | Domain Bacteria - Phylum Proteobacteria - Class Alphaproteobacteria. Hyphomonadaceae. | ICNB |
| Litosanthes | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Litosolenius | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora. | ICZN |
| Litothamnus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Litsea | Laurales | Mabberley (2008) | Lauraceae. | ICBN |
| Littledalea | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lituaria | Pennatulacea | Williams (1995) | . | ICZN |
| Lituola | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Lituolidae. | ICZN |
| Lituotuba | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Lituotubidae. | ICZN |
| Litwinowia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Liua | Caudata | Vitt & Caldwell (2009) | Hynobiidae. | ICZN |
| Livistona | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Lizzella | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Lizzia | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Llagunoa | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Llavea | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Llerasia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lloydia | Liliales | Mabberley (2008) | Liliaceae. | ICBN |
| Loasa | Cornales | Mabberley (2008) | Loasaceae. | ICBN |
| Lobanilia | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Lobatiriccardia | Metzgeriales | Crandall-Stotler et al. (2009) | . | ICBN |
| Lobatolampea | | Horita (2000) | Domain Eucarya - Phylum Ctenophora - Class Ctenoplanatea. Related to Cydippida and/or Lobata. | ICZN |
| Lobatula | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cibicididae. | ICZN |
| Lobelia | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Lobocella | Phaeogymnocellida | Takahashi & Anderson (2000) | . | ICZN |
| Lobochona | Exogemmida | Lynn (2008) | . | ICZN |
| Lobocolax | | Schneider & Wynne (2007) | . | ICBN |
| Lobodon | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Lobonema | Rhizostomeae | Kramp (1961) | . | ICZN |
| Lobonemoides | Rhizostomeae | Kramp (1961) | . | ICZN |
| Loboparadisea | Passeriformes | Clements (2007) | . | ICZN |
| Lobophyllia | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Lobophytum | Alcyonacea | Bayer (1981) | Alcyoniidae. | ICZN |
| Lobosphaera | | Darienko et al. (2010); Neustupa et al. (2011) | Domain Eucarya - Phylum Chlorophyta - Class Trebouxiophyceae. | ICBN |
| Lobostemon | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Lobularia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Lobulia | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Lochmaeotrochus | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Lochmias | Passeriformes | Clements (2007) | . | ICZN |
| Lockhartia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Locustella | Passeriformes | Clements (2007) | . | ICZN |
| Loddigesia | Apodiformes | Clements (2007) | . | ICZN |
| Lodoicea | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Loeblichopsis | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hormosinidae. | ICZN |
| Loefgrenia | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Loefgrenianthus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Loeflingia | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Loerzingia | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Loeselia | Ericales | Mabberley (2008) | Polemoniaceae. | ICBN |
| Loesenera | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Loeseneriella | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Loeskeobryum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Loeskypnum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Loewia | Malpighiales | Mabberley (2008) | Passifloraceae. | ICBN |
| Logania | Gentianales | Mabberley (2008) | Loganiaceae. | ICBN |
| Logfia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Loheria | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Lohmanniella | Choreotrichida | Lynn (2008) | . | ICZN |
| Loiseaubryum | Funariales | Goffinet et al. (2009) | . | ICBN |
| Loktanella | Rhodobacterales | Van Trappen et al. (2004) | . | ICNB |
| Loliolum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lolium | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lollipocladia | Poecilosclerida | Vacelet (2008) | . | ICZN |
| Loma | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Lomagramma | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Lomandra | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Lomariopsis | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Lomathamnion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Lomatia | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Lomatium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Lomatocarpa | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Lomatogoniopsis | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Lomatogonium | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Lomatophyllum | Asparagales | Mabberley (2008) | Asphodelaceae. | ICBN |
| Lomatozona | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lomelosia | Dipsacales | Mabberley (2008) | Caprifoliaceae. | ICBN |
| Lomentaria | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Lomiella | Astomatida | Lynn (2008) | . | ICZN |
| Lonas | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lonchiphora | Hexactinosida | Reiswig (2002) | . | ICZN |
| Lonchitis | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Lonchocarpus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Lonchophylla | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Lonchorhina | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Lonchostaurus | Arthracanthida | Febvre et al. (2000) | . | ICZN |
| Lonchostephus | Malpighiales | Mabberley (2008) | Podostemaceae. | ICBN |
| Lonchostoma | Bruniales | Mabberley (2008) | Bruniaceae. | ICBN |
| Lonchothrix | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Lonchura | Passeriformes | Clements (2007) | . | ICZN |
| Lonepinella | Pasteurellales | Garrity et al. (2005) | . | ICNB |
| Longetia | Malpighiales | Mabberley (2008) | Picrodendraceae. | ICBN |
| Longicollum | Echinorhynchida | Amin (1985) | . | ICZN |
| Longifragma | Prorodontida | Lynn (2008) | . | ICZN |
| Longilinea | Anaerolineales | Yamada et al. (2007) | . | ICNB |
| Longispatha | Haptorida | Lynn (2008) | . | ICZN |
| Longispora | Micromonosporales | Matsumoto et al. (2003); Ludwig et al. (2012) | . | ICNB |
| Longitricha | Prorodontida | Lynn (2008) | . | ICZN |
| Lonicera | Dipsacales | Mabberley (2008) | Caprifoliaceae. | ICBN |
| Lonsdalea | Enterobacteriales | Brady et al. (2012) | . | ICNB |
| Lontra | Carnivora | Wozencraft (2005) | . | ICZN |
| Lopezia | Myrtales | Mabberley (2008) | Onagraceae. | ICBN |
| Lopezoterenia | Microthoracida | Lynn (2008) | . | ICZN |
| Lophacme | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lophaetus | Falconiformes | Clements (2007) | . | ICZN |
| Lophanthera | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Lophanthus | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Lophatherum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lophelia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Lophiocarpus | Caryophyllales | Thorne & Reveal (2007); Mabberley (2008); Doweld & Reveal (2008) | Lophiocarpaceae. | ICBN |
| Lophiola | Dioscoreales | Mabberley (2008) | Nartheciaceae. | ICBN |
| Lophiomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Lophira | Malpighiales | Mabberley (2008) | Ochnaceae. | ICBN |
| Lophocalotes | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Lophocalyx | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Lophocarpinia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Lophocebus | Primates | Groves (2005) | . | ICZN |
| Lophocephaloides | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Lophocephalus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Lophocharis | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Lophochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lophocladia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Lophocolea | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Lophodinium | Ptychodiscales | Fensome et al. (1993) | . | ICBN |
| Lophodytes | Anseriformes | Clements (2007) | . | ICZN |
| Lophognathus | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Lophogorgia | Alcyonacea | Bayer (1981) | Gorgoniidae. | ICZN |
| Lophogyne | Malpighiales | Mabberley (2008) | Podostemaceae. | ICBN |
| Lophoictinia | Falconiformes | Clements (2007) | . | ICZN |
| Lopholaena | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lopholaimus | Columbiformes | Clements (2007) | . | ICZN |
| Lopholejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Lopholepis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lophomonas | | Cepicka et al. (2010); Gile & Slamovits (2012) | Domain Eucarya - Phylum Metamonada - Superclass Parabasalia. Closely related to Trichonymphida. | ICZN |
| Lophomyrtus | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Lophonardia | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Lophopappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lophopetalum | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Lophophaen | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Lophophanus | Passeriformes | Clements (2007) | . | ICZN |
| Lophophora | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Lophophorina | Chlamydodontida | Lynn (2008) | . | ICZN |
| Lophophorus | Galliformes | Clements (2007) | . | ICZN |
| Lophophysema | Amphidiscosida | Tabachnick & Menshenina (2002) | . | ICZN |
| Lophophytum | Santalales | Mabberley (2008) | Balanophoraceae. | ICBN |
| Lophopogon | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lophopterys | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Lophopyxis | Malpighiales | Mabberley (2008) | Lophopyxidaceae. | ICBN |
| Lophorina | Passeriformes | Clements (2007) | . | ICZN |
| Lophornis | Apodiformes | Clements (2007) | . | ICZN |
| Lophosiphonia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Lophosoria | Cyatheales | Christenhusz et al. (2011) | . | ICBN |
| Lophospermum | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Lophospingus | Passeriformes | Clements (2007) | . | ICZN |
| Lophospyris | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Lophostachys | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Lophostemon | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Lophostigma | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Lophostoma | Chiroptera | Simmons (2005) | . | ICZN |
| Lophostoma | Malvales | Mabberley (2008) | Thymelaeaceae. | ICBN |
| Lophostrix | Strigiformes | Clements (2007) | . | ICZN |
| Lophothalia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Lophothamnion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Lophotibis | Ciconiiformes | Clements (2007) | . | ICZN |
| Lophotriccus | Passeriformes | Clements (2007) | . | ICZN |
| Lophozia | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Lophozosterops | Passeriformes | Clements (2007) | . | ICZN |
| Lophura | Galliformes | Clements (2007) | . | ICZN |
| Lophurella | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Lophuromys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Lopidium | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Lopriorea | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Lorandersonia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Loranemertes | Pelagica | Gibson (1995) | . | ICZN |
| Loranthophycus | Ceramiales | Schneider & Wynne (2007) | Later synonym of Holmesia. | ICBN |
| Loranthus | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Lordhowea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lorentzianthus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lorentziella | Gigaspermales | Goffinet et al. (2009) | . | ICBN |
| Lorentzimys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Lorettaoides | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Loreya | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Loricalepis | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Loricaria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Loricodendron | Exogenida | Lynn (2008) | . | ICZN |
| Loricophrya | Exogenida | Lynn (2008) | . | ICZN |
| Loriculus | Psittaciformes | Clements (2007) | . | ICZN |
| Loriella | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Loriellopsis | Nostocales | Lamprinou et al. (2011) | Originally assigned to Stigonematales. | ICBN |
| Loris | Primates | McKenna & Bell (1997) | . | ICZN |
| Lorius | Psittaciformes | Clements (2007) | . | ICZN |
| Loropetalum | Saxifragales | Mabberley (2008) | Hamamelidaceae. | ICBN |
| Lorostemon | Malpighiales | Mabberley (2008) | Guttiferae. | ICBN |
| Lotharella | Chlorarachniales | Ishida et al. (2007); Ota et al. (2007) | . | ICBN |
| Lotononis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Lotus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Loudetia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Loudetiopsis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Louisiella | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lourteigia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lourtella | Myrtales | Mabberley (2008) | Lythraceae. | ICBN |
| Louteridium | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Lovenella | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Loveridgea | Squamata | Vitt & Caldwell (2009) | Amphisbaenidae. | ICZN |
| Loveridgelaps | Squamata | Vitt & Caldwell (2009) | Serpentes. Elapidae. | ICZN |
| Lovoa | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Loxanthera | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Loxia | Passeriformes | Clements (2007) | . | ICZN |
| Loxigilla | Passeriformes | Clements (2007) | . | ICZN |
| Loxioides | Passeriformes | Clements (2007) | . | ICZN |
| Loxipasser | Passeriformes | Clements (2007) | . | ICZN |
| Loxocalyx | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Loxocarya | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Loxocemus | Squamata | Vitt & Caldwell (2009) | Serpentes. Loxocemidae. | ICZN |
| Loxocephalus | Philasterida | Lynn (2008) | . | ICZN |
| Loxococcus | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Loxodera | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Loxodes | Loxodida | Lynn (2008) | . | ICZN |
| Loxodiscus | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Loxodon | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Loxodonta | Proboscidea | McKenna & Bell (1997) | . | ICZN |
| Loxodontomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Loxogramme | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Loxokalypus | Coloniales | Emschermann (1972); Nielsen (1982) | Loxokalypodidae. | ICZN |
| Loxomespilon | Solitaria | Emschermann (1972); Nielsen (1982); Nielsen (2010) | Junior synonym of Loxosomella. | ICZN |
| Loxomorpha | Eugregarinorida | Perkins et al. (2000); Özdikmen (2009) | Junior homonym. Substituted by Hoshidella. | ICZN |
| Loxonia | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Loxophyllum | Pleurostomatida | Lynn (2008) | . | ICZN |
| Loxops | Passeriformes | Clements (2007) | . | ICZN |
| Loxopterygium | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Loxosoma | Solitaria | Emschermann (1972); Nielsen (1982) | Loxosomatidae. | ICZN |
| Loxosomatoides | Coloniales | Emschermann (1972); Nielsen (1982) | Pedicellinidae. | ICZN |
| Loxosomella | Solitaria | Emschermann (1972); Nielsen (1982) | Loxosomatidae. | ICZN |
| Loxostemma | Solitaria | Emschermann (1972); Nielsen (1982); Nielsen (2010) | Junior synonym of Loxosoma. | ICZN |
| Loxostigma | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Loxostomina | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Siphogenerinoididae. | ICZN |
| Loxostylis | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Loxothysanus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Loxsoma | Cyatheales | Christenhusz et al. (2011) | . | ICBN |
| Loxsomopsis | Cyatheales | Christenhusz et al. (2011) | . | ICBN |
| Lozanella | Rosales | Mabberley (2008) | Cannabaceae. | ICBN |
| Lozania | Malpighiales | Mabberley (2008) | Lacistemataceae. | ICBN |
| Lubaria | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Lubetiella | Astomatida | Lynn (2008) | . | ICZN |
| Lubomirskia | Haplosclerida | Manconi & Pronzato (2002) | . | ICZN |
| Lucernaria | Stauromedusae | Kramp (1961) | . | ICZN |
| Lucernariopsis | Stauromedusae | Kramp (1961) | . | ICZN |
| Luciella | Peridiniales | Mason et al. (2007) | . | ICBN |
| Lucilia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Luciliocline | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Luculia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Lucya | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Ludekia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Ludia | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Ludio | Armophorida | Lynn (2008) | . | ICZN |
| Ludisia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Ludovia | Pandanales | Mabberley (2008) | Cyclanthaceae. | ICBN |
| Ludwigia | Myrtales | Mabberley (2008) | Onagraceae. | ICBN |
| Lueddemannia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Luedemannella | Micromonosporales | Ara & Kudo (2007); Ludwig et al. (2012) | . | ICNB |
| Luehea | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Lueheia | Polymorphida | Amin (1985) | . | ICZN |
| Lueheopsis | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Luetkenotyphlus | Gymnophiona | Vitt & Caldwell (2009) | "Caeciliidae". | ICZN |
| Luetzelburgia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Luffa | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Luffammina | Astrorhizida | Kaminski (2008) | Arboramminidae. | ICZN |
| Luffariella | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Luffisphaera | Luffisphaerida | Cavalier-Smith (2003) | . | ICZN |
| Lugdunum | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Bolivinidae. | ICZN |
| Lugonia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Luina | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Luisia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Luisierella | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Luisma | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Lukinia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Lulia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lullula | Passeriformes | Clements (2007) | . | ICZN |
| Luma | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Luminella | Tintinnida | Lynn (2008) | . | ICZN |
| Lumnitzera | Myrtales | Mabberley (2008) | Combretaceae. | ICBN |
| Lunania | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Lunaria | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Lunasia | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Lundellianthus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lundia | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Lundinia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lundomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Lunularia | Lunulariales | Crandall-Stotler et al. (2009) | . | ICBN |
| Luperosaurus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Lupinus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Luporinophrys | Haptorida | Lynn (2008) | . | ICZN |
| Lurocalis | Caprimulgiformes | Clements (2007) | . | ICZN |
| Luronium | Alismatales | Mabberley (2008) | Alismataceae. | ICBN |
| Luscinia | Passeriformes | Clements (2007) | . | ICZN |
| Lutaonella | Flavobacteriales | Arun et al. (2009) | . | ICNB |
| Luteibacter | Xanthomonadales | Johansen et al. (2005) | . | ICNB |
| Luteimicrobium | Micrococcales | Hamada et al. (2010); Ludwig et al. (2012) | . | ICNB |
| Luteimonas | Xanthomonadales | Garrity et al. (2005) | . | ICNB |
| Luteipulveratus | Micrococcales | Ara et al. (2010); Ludwig et al. (2012) | Dermacoccaceae. | ICNB |
| Luteococcus | Propionibacteriales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Luteolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Luteolibacter | Verrucomicrobiales | Yoon et al. (2008) | . | ICNB |
| Lutherella | Mischococcales | Ettl (1978) | . | ICBN |
| Lutibacter | Flavobacteriales | Choi & Cho (2006) | . | ICNB |
| Lutibaculum | Rhizobiales | Anil Kumar et al. (2012) | . | ICNB |
| Lutimaribacter | Rhodobacterales | Yoon et al. (2009) | . | ICNB |
| Lutimonas | Flavobacteriales | Yang et al. (2007) | . | ICNB |
| Lutispora | Clostridiales | Shiratori et al. (2008) | . | ICNB |
| Lutra | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Lutreolina | Ameridelphia | McKenna & Bell (1997) | . | ICZN |
| Lutrogale | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Luvunga | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Luxemburgia | Malpighiales | Mabberley (2008) | Ochnaceae. | ICBN |
| Luxiella | Tintinnida | Lynn (2008) | . | ICZN |
| Luxophrya | Exogenida | Lynn (2008) | . | ICZN |
| Luziola | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Luzula | Poales | Mabberley (2008) | Juncaceae. | ICBN |
| Luzuriaga | Liliales | Mabberley (2008) | Luzuriagaceae. | ICBN |
| Lwoffia | Rhynchodida | Lynn (2008) | . | ICZN |
| Lyallia | Caryophyllales | Mabberley (2008) | Portulacaceae. | ICBN |
| Lybius | Piciformes | Clements (2007) | . | ICZN |
| Lycalopex | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Lycaon | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Lycapsus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lycaste | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Lychnaspis | Arthracanthida | Febvre et al. (2000) | . | ICZN |
| Lychniothyrsus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Lychnocystis | Lychniscosida | Reiswig (2002) | . | ICZN |
| Lychnodiscus | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Lychnophora | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lychnophoriopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lychnorhiza | Rhizostomeae | Kramp (1961) | . | ICZN |
| Lychnothamnus | Charales | McCourt et al. (1999) | . | ICBN |
| Lycianthes | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Lyciasalamandra | Caudata | Vitt & Caldwell (2009) | Salamandridae. | ICZN |
| Lycium | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Lycochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lycocorax | Passeriformes | Clements (2007) | . | ICZN |
| Lycodon | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Lycodonomorphus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Lycodryas | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Lycogala | Liceales | Yamamoto (1998) | . | ICBN |
| Lycomormium | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Lycophidion | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Lycopodiella | Lycopodiales | Christenhusz et al. (2011) | . | ICBN |
| Lycopodium | Lycopodiales | Christenhusz et al. (2011) | . | ICBN |
| Lycopus | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Lycoris | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Lycoseris | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lydenburgia | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Lyellia | Polytrichales | Goffinet et al. (2009) | . | ICBN |
| Lygeum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Lyginia | Poales | Mabberley (2008) | Anarthriaceae. | ICBN |
| Lygisaurus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Lygisma | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Lygodactylus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Lygodesmia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Lygodium | Schizaeales | Christenhusz et al. (2011) | . | ICBN |
| Lygosoma | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Lymania | Poales | Mabberley (2008) | Bromeliaceae. | ICBN |
| Lymnocryptes | Charadriiformes | Clements (2007) | . | ICZN |
| Lymphotropha | Neogregarinorida | Perkins et al. (2000) | . | ICZN |
| Lynchella | Chlamydodontida | Lynn (2008) | . | ICZN |
| Lynchellodon | Chlamydodontida | Lynn (2008) | . | ICZN |
| Lynchnagalma | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Lyncodon | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Lyngbya | Oscillatoriales | Hoffmann et al. (2005) | . | ICBN |
| Lyngbyopsis | Oscillatoriales | Hoffmann et al. (2005) | . | ICBN |
| Lynnella | | Liu et al. (2011) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora - Class Spirotrichea - Subclass Choreotrichia. | ICZN |
| Lynx | Carnivora | Wozencraft (2005) | . | ICZN |
| Lyonia | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Lyonothamnus | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Lyperanthus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Lyperia | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Lyriocephalus | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Lyrocarpa | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Lyrocteis | Platyctenida | Harbison & Madin (1982) | . | ICZN |
| Lyroglossa | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Lyromonas | Lyromonadida | Cavalier-Smith (2003) | . | ICZN |
| Lysiana | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Lysicarpus | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Lysichiton | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Lysidice | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Lysiloma | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Lysimachia | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Lysinema | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Lysinibacillus | Bacillales | Ahmed et al. (2007) | . | ICNB |
| Lysinimicrobium | Micrococcales | Hamada et al. (2012) | . | ICNB |
| Lysionotus | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Lysiosepalum | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Lysiostyles | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Lysiphyllum | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Lysipomia | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Lysithea | Bangiales | Sutherland et al. (2011) | . | ICBN |
| Lysobacter | Xanthomonadales | Garrity et al. (2005) | . | ICNB |
| Lystrophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Lysurus | Passeriformes | Clements (2007) | . | ICZN |
| Lythrum | Myrtales | Mabberley (2008) | Lythraceae. | ICBN |
| Lyticum | Rickettsiales | Garrity et al. (2005) | . | ICNB |
| Lytocarpia | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Lytocaryum | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Lytorhynchus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Lytreia | Alcyonacea | Bayer (1981) | Plexauridae. | ICZN |