- genus dodonaea
- genus dolichonyx
- genus dolichos
- genus dolichotis
- genus doliolum
- genus dombeya
- genus doodia
- genus doronicum
- genus dorotheanthus
- genus doryopteris
- genus dovyalis
- genus draba
- genus dracaena
- genus draco
- genus dracocephalum
- genus dracontium
- genus dracula
- genus dracunculus
- genus dreissena
- genus drepanis
- genus drimys
- genus dromaius
- genus drosera
- genus drosophila
- genus drosophyllum
- genus dryadella
- genus dryas
- genus drymarchon
- genus drymoglossum
- genus drynaria
- genus dryopithecus
- genus dryopteris
- genus drypis
- genus dugong
- genus dumetella
- genus durio
- genus dusicyon
- genus dysdercus
- genus eacles
- genus eburophyton
- genus ecballium
- genus echeneis
- genus echidnophaga
- genus echinacea
- genus echinocactus
- genus echinocereus
- genus echinochloa
- genus echinococcus
- genus echinops
- genus echium
- genus ectopistes
- genus edaphosaurus
- genus edmontosaurus
- genus egeria
- genus egretta
- genus eichhornia
- genus eimeria
- genus eira
- genus elaeagnus
- genus elaeis
- genus elaeocarpus
- genus elagatis
- genus elanoides
- genus elanus
- genus elaphe
- genus elaphurus
- genus electrophorus
- genus eleocharis
- genus elephantopus
- genus elephas
- genus elettaria
- genus eleusine
- genus eleutherodactylus
- genus eliomys
- genus elodea
- genus elops
- genus elsholtzia
- genus elymus
- genus emberiza
- genus embothrium
- genus emilia
- genus emmanthe
- genus empetrum
- genus encelia
- genus enceliopsis
- genus encephalartos
- genus encyclia
- genus endamoeba
- genus engelmannia
- genus engraulis
- genus enhydra
- genus ensete
- genus ensis
- genus entandrophragma
- genus entelea
- genus enterobius
- genus enterolobium
- genus entoloma
- genus entomophthora
- genus eoraptor
- genus epacris
- genus ephedra
- genus ephestia
- genus ephippiorhynchus
- genus epidendrum
- genus epigaea
- genus epilachna
- genus epilobium
- genus epimedium
- genus epinephelus
- genus epipactis
- genus epiphyllum
- genus epipremnum
- genus episcia
- genus eptatretus
- genus eptesicus
- genus equetus
- genus equisetum
- genus equus
- genus eragrostis
- genus eranthis
- genus ercilla
- genus erechtites
- genus erethizon
- genus eretmochelys
- genus erianthus
- genus erica
- genus erigeron
- genus erignathus
- genus erinaceus
- genus eriobotrya
- genus eriocaulon
- genus eriodictyon
- genus eriogonum
- genus eriophorum
- genus eriophyllum
- genus eriosoma
- genus erithacus
- genus erodium
- genus erolia
- genus eruca
- genus erwinia
- genus eryngium
- genus erysimum
- genus erysiphe
- genus erythrina
- genus erythrocebus
- genus erythronium
- genus erythroxylon
- genus erythroxylum
- genus escherichia
- genus eschrichtius
- genus eschscholtzia
- genus esox
- genus estrilda
- genus etropus
- genus euarctos
- genus eucalyptus
- genus eucarya
- genus eucinostomus
- genus euderma
- genus eudyptes
- genus eugenia
- genus euglena
- genus eumeces
- genus eumenes
- genus eumetopias
- genus eumops
- genus eunectes
- genus euonymus
- genus eupatorium
- genus euphagus
- genus euphorbia
- genus euphractus
- genus euplectella
- genus euproctis
- genus eurotium
- genus euryale
- genus eustoma
- genus eutamias
- genus euterpe
- genus euthynnus
- genus evernia
- genus exacum
- genus exaeretodon
- genus fabiana
- genus fagopyrum
- genus fagus
- genus falcatifolium
- genus falco
- genus fasciola
- genus fasciolopsis
- genus feijoa
- genus felicia
- genus felis
- genus ferocactus
- genus festuca
- genus ficus
- genus filago
- genus firmiana