- genus fissurella
- genus fistularia
- genus fistulina
- genus flacourtia
- genus flammulina
- genus flindersia
- genus foeniculum
- genus fomes
- genus forestiera
- genus forficula
- genus formica
- genus formicarius
- genus forsythia
- genus fortunella
- genus fossa
- genus fothergilla
- genus fouquieria
- genus fragaria
- genus francisella
- genus francoa
- genus frankliniella
- genus frasera
- genus fratercula
- genus fraxinus
- genus freesia
- genus fregata
- genus fremontia
- genus fremontodendron
- genus fringilla
- genus fritillaria
- genus froelichia
- genus fuchsia
- genus fucus
- genus fulica
- genus fulmarus
- genus fumaria
- genus fundulus
- genus fungia
- genus funka
- genus furnarius
- genus fusanus
- genus fusarium
- genus fuscoboletinus
- genus gadus
- genus gaillardia
- genus galago
- genus galax
- genus galega
- genus galeocerdo
- genus galeopsis
- genus galeorhinus
- genus galictis
- genus galium
- genus galleria
- genus gallinago
- genus gallinula
- genus gallirallus
- genus gallus
- genus gambelia
- genus gambusia
- genus garcinia
- genus gardenia
- genus garrulus
- genus gasterophilus
- genus gasterosteus
- genus gastroboletus
- genus gastrocybe
- genus gastrolobium
- genus gastrophryne
- genus gaultheria
- genus gavia
- genus gavialis
- genus gaylussacia
- genus gazania
- genus gazella
- genus geastrum
- genus gelechia
- genus gelsemium
- genus gempylus
- genus genetta
- genus genipa
- genus genista
- genus genlisea
- genus gentiana
- genus gentianella
- genus gentianopsis
- genus genyonemus
- genus geochelone
- genus geococcyx
- genus geoffroea
- genus geoglossum
- genus geomys
- genus geophilus
- genus geothlypis
- genus geranium
- genus gerardia
- genus gerbera
- genus gerbillus
- genus gerea
- genus gerres
- genus gerrhonotus
- genus gerris
- genus gesneria
- genus geum
- genus giardia
- genus ginglymostoma
- genus ginkgo
- genus giraffa
- genus gladiolus
- genus glareola
- genus glaucium
- genus glaucomys
- genus glaux
- genus glechoma
- genus gleditsia
- genus gleichenia
- genus gliricidia
- genus glis
- genus globicephala
- genus globigerina
- genus gloriosa
- genus glossina
- genus glossodia
- genus glossopsitta
- genus gloxinia
- genus glyceria
- genus glycine
- genus glycyrrhiza
- genus gnaphalium
- genus gnetum
- genus gobiesox
- genus gobio
- genus gomphotherium
- genus gomphrena
- genus goniopteris
- genus gonorhynchus
- genus goodyera
- genus gopherus
- genus gorgonocephalus
- genus gorilla
- genus gossypium
- genus gracula
- genus grammatophyllum
- genus grampus
- genus graptophyllum
- genus grevillea
- genus grewia
- genus grias
- genus grindelia
- genus griselinia
- genus grison
- genus groenlandia
- genus grus
- genus guaiacum
- genus guevina
- genus gulo
- genus gutierrezia
- genus gymnadenia
- genus gymnadeniopsis
- genus gymnelis
- genus gymnocalycium
- genus gymnocarpium
- genus gymnocladus
- genus gymnogyps
- genus gymnopilus
- genus gymnorhina
- genus gymnosporangium
- genus gymnura
- genus gynura
- genus gypaetus
- genus gyps
- genus gypsophila
- genus gyromitra
- genus haastia
- genus habenaria
- genus hackelia
- genus haemanthus
- genus haematobia
- genus haematopus
- genus haematoxylon
- genus haematoxylum
- genus haemodorum
- genus haemopis
- genus haemoproteus
- genus haemulon
- genus hakea
- genus halcyon
- genus haldea
- genus halenia
- genus halesia
- genus haliaeetus
- genus halicoeres
- genus halimodendron
- genus haliotis
- genus halocarpus
- genus halogeton
- genus hamamelidanthum
- genus hamamelidoxylon
- genus hamamelis
- genus hamamelites