| columnea minutiflora | Yes | species | eukaryota | plants | species | 356125 | click here |
| comarum palustre | Yes | species | eukaryota | plants | species | 57932 | click here |
| comaster schlegelii | Yes | species | | | species | 1529421 | click here |
| convolvulus arvensis | Yes | species | eukaryota | plants | species | 4123 | click here |
| convolvulus fruticosus | Yes | species | | | species | 1428909 | click here |
| copaifera langsdorffii | Yes | species | eukaryota | plants | species | 280048 | click here |
| coptotermes formosanus | Yes | species | eukaryota | invertebrates | species | 36987 | click here |
| corallina officinalis | Yes | species | eukaryota | plants | species | 35170 | click here |
| cordia dichotoma | Yes | species | | | species | 992840 | click here |
| corethrodendron scoparium | Yes | species | | | species | 1402424 | click here |
| cornulaca | Yes | | | plants | genus | 454474 | click here |
| cornulaca monacantha | Yes | species | eukaryota | plants | species | 454476 | click here |
| cornus | Yes | | | plants | genus | 4281 | click here |
| cornus alba | Yes | species | eukaryota | plants | species | 367337 | click here |
| corticium candelabrum | Yes | species | eukaryota | invertebrates | species | 121492 | click here |
| corydalis yanhusuo | Yes | species | eukaryota | plants | species | 458692 | click here |
| corylus avellana | Yes | species | eukaryota | plants | species | 13451 | click here |
| cosmos caudatus | Yes | species | | | species | 1125397 | click here |
| costus pictus | Yes | species | eukaryota | plants | species | 168183 | click here |
| cotoneaster | Yes | | | plants | genus | 36607 | click here |
| coturnix coturnix | Yes | species | eukaryota | vertebrates | species | 9091 | click here |
| coturnix japonica | Yes | species | eukaryota | vertebrates | species | 93934 | click here |
| crassostrea gigas | Yes | species | eukaryota | invertebrates | species | 29159 | click here |
| crassula | Yes | | | plants | genus | 3782 | click here |
| crataegus crus-galli | Yes | no rank | eukaryota | plants | species | 216036 | click here |
| crataegus monogyna | Yes | species | eukaryota | plants | species | 140997 | click here |
| crescentia cujete | Yes | species | | | species | 1125401 | click here |
| crinoidea | Yes | | | invertebrates | class | 35069 | click here |
| crithmum maritimum | Yes | species | eukaryota | plants | species | 40916 | click here |
| crocus sativus | Yes | species | eukaryota | plants | species | 82528 | click here |
| crustacea | Yes | | | invertebrates | subphylum | 6657 | click here |
| cryptotympana facialis | Yes | species | eukaryota | invertebrates | species | 911377 | click here |
| cucumis melo | Yes | species | eukaryota | plants | species | 3656 | click here |
| cucumis sativus | Yes | species | eukaryota | plants | species | 3659 | click here |
| cucurbita | Yes | | | plants | genus | 3660 | click here |
| cucurbita pepo | Yes | species | eukaryota | plants | species | 3663 | click here |
| culex | Yes | | | invertebrates | genus | 7174 | click here |
| culex erythrothorax | Yes | species | eukaryota | invertebrates | species | 42428 | click here |
| culicidae | Yes | | | invertebrates | family | 7157 | click here |
| cuminum cyminum | Yes | species | eukaryota | plants | species | 52462 | click here |
| cupressus sempervirens | Yes | species | eukaryota | plants | species | 13469 | click here |
| curculigo orchioides | Yes | species | eukaryota | plants | species | 681286 | click here |
| curculionidae | Yes | | | invertebrates | family | 7042 | click here |
| curcuma aromatica | Yes | species | eukaryota | plants | species | 136209 | click here |
| curcuma longa | Yes | species | eukaryota | plants | species | 136217 | click here |
| curcuma wenyujin | Yes | species | eukaryota | plants | species | 136221 | click here |
| cyanocitta cristata | Yes | species | eukaryota | vertebrates | species | 28727 | click here |
| cyanthillium cinereum | Yes | species | eukaryota | plants | species | 211151 | click here |
| cyathea contaminans | Yes | species | eukaryota | plants | species | 204587 | click here |
| cycas debaoensis | Yes | species | eukaryota | plants | species | 470941 | click here |
| cycas fairylakea | Yes | species | eukaryota | plants | species | 171011 | click here |
| cyclopeltis semicordata | Yes | species | eukaryota | plants | species | 449831 | click here |
| cydonia oblonga | Yes | species | eukaryota | plants | species | 36610 | click here |
| cygnus olor | Yes | species | eukaryota | vertebrates | species | 8869 | click here |
| cymbastela concentrica | Yes | species | eukaryota | invertebrates | species | 484451 | click here |
| cymbidium aloifolium | Yes | species | eukaryota | plants | species | 112603 | click here |
| cymbidium ensifolium | Yes | species | eukaryota | plants | species | 78740 | click here |
| cymbidium insigne | Yes | species | eukaryota | plants | species | 112609 | click here |
| cymbidium kanran | Yes | species | eukaryota | plants | species | 112611 | click here |
| cymodocea nodosa | Yes | species | eukaryota | plants | species | 55448 | click here |
| cymodocea rotundata | Yes | species | | | species | 1046423 | click here |
| cymodocea serrulata | Yes | species | eukaryota | plants | species | 55449 | click here |
| cynodon dactylon | Yes | species | eukaryota | plants | species | 28909 | click here |
| cynomorium songaricum | Yes | species | eukaryota | plants | species | 627609 | click here |
| cyperus | Yes | | | plants | genus | 4610 | click here |
| cyperus esculentus | Yes | species | | | species | 1053340 | click here |
| cyperus papyrus | Yes | species | eukaryota | plants | species | 76434 | click here |
| cyprinus carpio | Yes | species | eukaryota | vertebrates | species | 7962 | click here |
| cypripedium | Yes | | | plants | genus | 38190 | click here |
| cytilus sericeus | Yes | species | eukaryota | invertebrates | species | 338699 | click here |
| dactylis glomerata | Yes | species | eukaryota | plants | species | 4509 | click here |
| dactylopius coccus | Yes | species | eukaryota | invertebrates | species | 765876 | click here |
| dactylopius opuntiae | Yes | species | eukaryota | invertebrates | species | 701504 | click here |
| dactylorhiza incarnata subsp. ochroleuca | Yes | species | eukaryota | plants | species | 329320 | click here |
| dactylorhiza purpurella | Yes | species | eukaryota | plants | species | 231483 | click here |
| dalbergia obovata | Yes | species | | | species | 1237534 | click here |
| dalbergia odorifera | Yes | species | eukaryota | plants | species | 499988 | click here |
| dalbergia sissoo | Yes | species | eukaryota | plants | species | 107308 | click here |
| damon diadema | Yes | species | eukaryota | invertebrates | species | 317680 | click here |
| daphniphyllum oldhamii | Yes | species | | | species | 1008903 | click here |
| datura inoxia | Yes | species | eukaryota | plants | species | 4075 | click here |
| datura metel | Yes | species | eukaryota | plants | species | 35625 | click here |
| debregeasia salicifolia | Yes | species | eukaryota | plants | species | 210330 | click here |
| decaisnea fargesii | Yes | species | eukaryota | plants | species | 41780 | click here |
| delphinapterus leucas | Yes | species | eukaryota | mammals | species | 9749 | click here |
| delphinium denudatum | Yes | species | | | species | 1127156 | click here |
| dendrobium | Yes | | | plants | genus | 37818 | click here |
| dendrobium catenatum | Yes | species | eukaryota | plants | species | 142615 | click here |
| dendrobium chrysanthum | Yes | species | eukaryota | plants | species | 154291 | click here |
| dendrobium crepidatum | Yes | species | eukaryota | plants | species | 154289 | click here |
| dendrobium formosum | Yes | species | eukaryota | plants | species | 234011 | click here |
| dendrobium huoshanense | Yes | species | eukaryota | plants | species | 154293 | click here |
| dendrobium moschatum | Yes | species | eukaryota | plants | species | 117955 | click here |
| dendrobium regium | Yes | species | | | species | 906854 | click here |
| dendrobium speciosum | Yes | species | eukaryota | plants | species | 234039 | click here |
| dendroctonus rufipennis | Yes | species | eukaryota | invertebrates | species | 77170 | click here |
| deroceras invadens | Yes | species | | | species | 1073088 | click here |
| derris trifoliata | Yes | species | eukaryota | plants | species | 185716 | click here |
| desbordesia glaucescens | Yes | species | eukaryota | plants | species | 300981 | click here |
| deschampsia antarctica | Yes | species | eukaryota | plants | species | 159298 | click here |