- genus cracticus
- genus crambe
- genus crangon
- genus craspedia
- genus crassostrea
- genus crassula
- genus crataegus
- genus crateva
- genus crax
- genus crepis
- genus crescentia
- genus crex
- genus cricetus
- genus crocethia
- genus crocodilus
- genus crocodylus
- genus crocus
- genus crocuta
- genus cronartium
- genus crotalaria
- genus crotalus
- genus crotaphytus
- genus croton
- genus crotophaga
- genus cryptacanthodes
- genus cryptobranchus
- genus cryptocercus
- genus cryptocoryne
- genus cryptogramma
- genus cryptomeria
- genus cryptoprocta
- genus cryptotermes
- genus cryptotis
- genus ctenocephalides
- genus ctenocephalus
- genus cuculus
- genus cucumis
- genus cucurbita
- genus culcita
- genus culex
- genus cuminum
- genus cuniculus
- genus cuon
- genus cupressus
- genus curcuma
- genus cursorius
- genus curtisia
- genus cuscuta
- genus cuterebra
- genus cyamopsis
- genus cyamus
- genus cyanocitta
- genus cyathea
- genus cycas
- genus cyclamen
- genus cycloloma
- genus cyclopes
- genus cyclophorus
- genus cyclops
- genus cyclopterus
- genus cyclosorus
- genus cycnoches
- genus cydonia
- genus cygnus
- genus cymbidium
- genus cynancum
- genus cynara
- genus cynips
- genus cynocephalus
- genus cynodon
- genus cynoglossum
- genus cynomys
- genus cynopterus
- genus cynoscion
- genus cyon
- genus cyperus
- genus cyphomandra
- genus cypraea
- genus cyprinus
- genus cypripedium
- genus cyrilla
- genus cyrtomium
- genus cystophora
- genus cystopteris
- genus cytisus
- genus daboecia
- genus dacelo
- genus dacrycarpus
- genus dacrydium
- genus dacrymyces
- genus dactylis
- genus dactyloctenium
- genus dactylopius
- genus dactylopterus
- genus dactylorhiza
- genus dahlia
- genus dalbergia
- genus dalea
- genus dama
- genus damaliscus
- genus danaea
- genus danaus
- genus daphne
- genus daphnia
- genus darlingtonia
- genus darmera
- genus dasyatis
- genus dasyprocta
- genus dasypus
- genus dasyurus
- genus datura
- genus daubentonia
- genus daucus
- genus davallia
- genus daviesia
- genus decapterus
- genus decumaria
- genus deinocheirus
- genus deinonychus
- genus delairea
- genus delichon
- genus delonix
- genus delphinapterus
- genus delphinium
- genus delphinus
- genus dendranthema
- genus dendraspis
- genus dendroaspis
- genus dendrobium
- genus dendrocalamus
- genus dendrocolaptes
- genus dendroctonus
- genus dendroica
- genus dendrolagus
- genus dendromecon
- genus denisonia
- genus dennstaedtia
- genus dentaria
- genus deparia
- genus dermacentor
- genus dermatobia
- genus dermochelys
- genus derris
- genus descurainia
- genus desmanthus
- genus desmidium
- genus desmodium
- genus desmodus
- genus desmograthus
- genus deutzia
- genus diacalpa
- genus diadophis
- genus dialeurodes
- genus dianthus
- genus diapensia
- genus diapheromera
- genus dicamptodon
- genus dicentra
- genus diceros
- genus dichondra
- genus dicksonia
- genus dicranopteris
- genus dicranum
- genus dicrostonyx
- genus dictamnus
- genus dictostylium
- genus dictyophera
- genus didelphis
- genus dieffenbachia
- genus diervilla
- genus difflugia
- genus digitalis
- genus digitaria
- genus dillenia
- genus dimetrodon
- genus dimocarpus
- genus dimorphotheca
- genus dinornis
- genus diodon
- genus diomedea
- genus dionaea
- genus dioon
- genus dioscorea
- genus diospyros
- genus diphylla
- genus dipladenia
- genus diplococcus
- genus diplodocus
- genus diplopterygium
- genus diplotaxis
- genus dipodomys
- genus dipogon
- genus dipsacus
- genus dipsosaurus
- genus dipteronia
- genus dipteryx
- genus dipus
- genus dirca
- genus disa
- genus discina