| citrus limetta | Yes | species | eukaryota | plants | species | 414735 | click here |
| citrus limettioides | Yes | species | eukaryota | plants | species | 200542 | click here |
| citrus limon | Yes | species | eukaryota | plants | species | 2708 | click here |
| citrus limonia | Yes | species | eukaryota | plants | species | 171249 | click here |
| citrus nobilis | Yes | species | eukaryota | plants | species | 481549 | click here |
| citrus reticulata | Yes | species | eukaryota | plants | species | 85571 | click here |
| citrus sinensis | Yes | species | eukaryota | plants | species | 2711 | click here |
| citrus suavissima | Yes | species | | | species | 1450747 | click here |
| citrus unshiu | Yes | species | eukaryota | plants | species | 55188 | click here |
| citrus x paradisi | Yes | subspecies | eukaryota | plants | species | 37656 | click here |
| citrus x tangelo | Yes | no rank | eukaryota | plants | species | 229630 | click here |
| clarkia | Yes | | | plants | genus | 3935 | click here |
| cleisostoma williamsonii | Yes | species | | | species | 1497770 | click here |
| cleistanthus collinus | Yes | species | | | species | 1357584 | click here |
| clematis brevicaudata | Yes | species | eukaryota | plants | species | 748691 | click here |
| clematis japonica | Yes | species | eukaryota | plants | species | 231650 | click here |
| clematis terniflora var. mandshurica | Yes | varietas | eukaryota | plants | varietas | 748703 | click here |
| clinopodium nepeta | Yes | species | eukaryota | plants | species | 306383 | click here |
| coccus viridis | Yes | species | eukaryota | invertebrates | species | 589264 | click here |
| cochlearia officinalis | Yes | species | eukaryota | plants | species | 270110 | click here |
| codium fragile | Yes | species | eukaryota | plants | species | 3133 | click here |
| codium tomentosum | Yes | species | | | species | 713099 | click here |
| codonopsis pilosula | Yes | species | eukaryota | plants | species | 86864 | click here |
| coffea arabica | Yes | species | eukaryota | plants | species | 13443 | click here |
| coleostephus myconis | Yes | species | eukaryota | plants | species | 99042 | click here |
| colocasia esculenta | Yes | species | eukaryota | plants | species | 4460 | click here |
| combretum indicum | Yes | species | eukaryota | plants | species | 3956 | click here |
| combretum kraussii | Yes | species | eukaryota | plants | species | 507410 | click here |
| combretum latifolium | Yes | species | | | species | 1481158 | click here |
| conocarpus erectus | Yes | species | eukaryota | plants | species | 134917 | click here |
| convolvulus arvensis | Yes | species | eukaryota | plants | species | 4123 | click here |
| convolvulus fruticosus | Yes | species | | | species | 1428909 | click here |
| cordia dichotoma | Yes | species | | | species | 992840 | click here |
| cordia myxa | Yes | species | eukaryota | plants | species | 181185 | click here |
| coreopsis | Yes | | | plants | genus | 13448 | click here |
| coreopsis basalis | Yes | species | eukaryota | plants | species | 159655 | click here |
| coreopsis lanceolata | Yes | species | eukaryota | plants | species | 159666 | click here |
| corethrodendron scoparium | Yes | species | | | species | 1402424 | click here |
| coriandrum sativum | Yes | species | eukaryota | plants | species | 4047 | click here |
| cornus | Yes | | | plants | genus | 4281 | click here |
| cornus officinalis | Yes | species | eukaryota | plants | species | 16906 | click here |
| corylus avellana | Yes | species | eukaryota | plants | species | 13451 | click here |
| cosmos bipinnatus | Yes | species | eukaryota | plants | species | 51277 | click here |
| cotinus coggygria | Yes | species | eukaryota | plants | species | 269719 | click here |
| cotoneaster | Yes | | | plants | genus | 36607 | click here |
| couroupita guianensis | Yes | species | eukaryota | plants | species | 66684 | click here |
| crataegus monogyna | Yes | species | eukaryota | plants | species | 140997 | click here |
| crataegus pentagyna | Yes | species | eukaryota | plants | species | 416291 | click here |
| crataegus pinnatifida | Yes | species | eukaryota | plants | species | 510735 | click here |
| cremastra appendiculata | Yes | species | eukaryota | plants | species | 459596 | click here |
| crescentia alata | Yes | species | eukaryota | plants | species | 680237 | click here |
| crocus sativus | Yes | species | eukaryota | plants | species | 82528 | click here |
| ctenanthe oppenheimiana | Yes | species | eukaryota | plants | species | 94349 | click here |
| cucumis | Yes | | | plants | genus | 3655 | click here |
| cucumis melo | Yes | species | eukaryota | plants | species | 3656 | click here |
| cucumis melo subsp. agrestis | Yes | subspecies | eukaryota | plants | subspecies | 217619 | click here |
| cucumis melo var. inodorus | Yes | varietas | eukaryota | plants | varietas | 357961 | click here |
| cucumis sativus | Yes | species | eukaryota | plants | species | 3659 | click here |
| cucurbita | Yes | | | plants | genus | 3660 | click here |
| cucurbita maxima | Yes | species | eukaryota | plants | species | 3661 | click here |
| cucurbita pepo | Yes | species | eukaryota | plants | species | 3663 | click here |
| cucurbitaceae | Yes | | | plants | family | 3650 | click here |
| cuminum cyminum | Yes | species | eukaryota | plants | species | 52462 | click here |
| curcuma longa | Yes | species | eukaryota | plants | species | 136217 | click here |
| cuscuta | Yes | | | plants | genus | 4128 | click here |
| cuscuta cuspidata | Yes | species | eukaryota | plants | species | 113196 | click here |
| cyamopsis tetragonoloba | Yes | species | eukaryota | plants | species | 3832 | click here |
| cycas revoluta | Yes | species | eukaryota | plants | species | 3396 | click here |
| cycnogeton procerum | Yes | species | eukaryota | plants | species | 55446 | click here |
| cydonia oblonga | Yes | species | eukaryota | plants | species | 36610 | click here |
| cymodocea serrulata | Yes | species | eukaryota | plants | species | 55449 | click here |
| cynanchum acutum | Yes | species | eukaryota | plants | species | 185024 | click here |
| cynanchum otophyllum | Yes | species | eukaryota | plants | species | 765270 | click here |
| cynara cardunculus | Yes | species | eukaryota | plants | species | 4265 | click here |
| cynara cardunculus var. scolymus | Yes | varietas | eukaryota | plants | varietas | 59895 | click here |
| cynodon dactylon | Yes | species | eukaryota | plants | species | 28909 | click here |
| cynomorium songaricum | Yes | species | eukaryota | plants | species | 627609 | click here |
| cyperaceae | Yes | | | plants | family | 4609 | click here |
| cyperus | Yes | | | plants | genus | 4610 | click here |
| cyperus laevigatus | Yes | species | eukaryota | plants | species | 76432 | click here |
| cyperus papyrus | Yes | species | eukaryota | plants | species | 76434 | 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 |
| dalea candida | Yes | species | eukaryota | plants | species | 252452 | click here |
| dalea purpurea | Yes | species | eukaryota | plants | species | 248511 | click here |
| datura | Yes | | | plants | genus | 4074 | click here |
| datura inoxia | Yes | species | eukaryota | plants | species | 4075 | click here |
| datura metel | Yes | species | eukaryota | plants | species | 35625 | click here |
| datura stramonium | Yes | species | eukaryota | plants | species | 4076 | click here |
| daucus carota | Yes | species | eukaryota | plants | species | 4039 | click here |
| daucus carota subsp. sativus | Yes | subspecies | eukaryota | plants | subspecies | 79200 | click here |
| delonix regia | Yes | species | eukaryota | plants | species | 72433 | click here |
| dendrobium candidum | Yes | species | eukaryota | plants | species | 431188 | click here |
| dendrobium catenatum | Yes | species | eukaryota | plants | species | 142615 | click here |
| dendrobium heterocarpum | Yes | species | eukaryota | plants | species | 257361 | click here |
| dendrobium huoshanense | Yes | species | eukaryota | plants | species | 154293 | click here |
| dendrobium longicornu | Yes | species | eukaryota | plants | species | 257357 | click here |
| dendropanax arboreus | Yes | species | eukaryota | plants | species | 46395 | click here |
| deschampsia antarctica | Yes | species | eukaryota | plants | species | 159298 | click here |