| ceriops tagal | Yes | species | eukaryota | plants | species | 61143 | click here |
| cestrum parqui | Yes | species | eukaryota | plants | species | 142762 | click here |
| cetrelia olivetorum | Yes | species | eukaryota | plants | species | 180479 | click here |
| chaenomeles speciosa | Yes | species | eukaryota | plants | species | 106546 | click here |
| chamaecyparis obtusa | Yes | species | eukaryota | plants | species | 13415 | click here |
| chamaedorea elegans | Yes | species | eukaryota | plants | species | 348465 | click here |
| chamaedorea seifrizii | Yes | species | eukaryota | plants | species | 77339 | click here |
| chamaerops humilis | Yes | species | eukaryota | plants | species | 54446 | click here |
| champia | Yes | | | plants | genus | 39625 | click here |
| cheilocostus speciosus | Yes | species | eukaryota | plants | species | 49577 | click here |
| chelonia mydas | Yes | species | eukaryota | vertebrates | species | 8469 | click here |
| chenopodium | Yes | | | plants | genus | 3558 | click here |
| chenopodium album | Yes | species | eukaryota | plants | species | 3559 | click here |
| chenopodium quinoa | Yes | species | eukaryota | plants | species | 63459 | click here |
| chevaliera tayoensis | Yes | species | eukaryota | plants | species | 714029 | click here |
| chimaphila umbellata | Yes | species | eukaryota | plants | species | 93815 | click here |
| chinchilla | Yes | | | rodents | genus | 10151 | click here |
| chionanthus virginicus | Yes | species | eukaryota | plants | species | 126363 | click here |
| chloris barbata | Yes | species | eukaryota | plants | species | 167333 | click here |
| chloris gayana | Yes | species | eukaryota | plants | species | 110876 | click here |
| chloris virgata | Yes | species | eukaryota | plants | species | 314391 | click here |
| chlorophytum borivilianum | Yes | species | eukaryota | plants | species | 503355 | click here |
| chondrus crispus | Yes | species | eukaryota | plants | species | 2769 | click here |
| chromolaena odorata | Yes | species | eukaryota | plants | species | 103745 | click here |
| chrysanthemum | Yes | | | plants | genus | 13422 | click here |
| chrysanthemum indicum | Yes | species | eukaryota | plants | species | 146995 | click here |
| chrysanthemum sp. | Yes | no rank | eukaryota | plants | species | 137606 | click here |
| chrysanthemum x morifolium | Yes | subspecies | eukaryota | plants | species | 41568 | click here |
| cicer anatolicum | Yes | species | eukaryota | plants | species | 242878 | click here |
| cicer arietinum | Yes | species | eukaryota | plants | species | 3827 | click here |
| cicer isauricum | Yes | species | eukaryota | plants | species | 380785 | click here |
| cicer judaicum | Yes | species | eukaryota | plants | species | 92719 | click here |
| cicer montbretii | Yes | species | eukaryota | plants | species | 242879 | click here |
| cichorium endivia | Yes | species | eukaryota | plants | species | 114280 | click here |
| cichorium intybus | Yes | species | eukaryota | plants | species | 13427 | click here |
| cinchona calisaya | Yes | species | eukaryota | plants | species | 153742 | click here |
| cineraria | Yes | | | plants | genus | 82361 | click here |
| cinnamomum aromaticum | Yes | species | eukaryota | plants | species | 119260 | click here |
| ciona intestinalis | Yes | species | eukaryota | invertebrates | species | 7719 | click here |
| cirsium | Yes | | | plants | genus | 41549 | click here |
| cirsium arvense | Yes | species | eukaryota | plants | species | 41550 | click here |
| cirsium heterophyllum | Yes | species | eukaryota | plants | species | 675739 | click here |
| cirsium setidens | Yes | species | | | species | 859427 | click here |
| cirsium spinosissimum | Yes | species | eukaryota | plants | species | 196741 | click here |
| cissus quadrangularis | Yes | species | eukaryota | plants | species | 165298 | click here |
| cistus monspeliensis | Yes | species | eukaryota | plants | species | 335184 | click here |
| citronella | Yes | | | plants | genus | 159356 | click here |
| citrullus lanatus | Yes | species | eukaryota | plants | species | 3654 | click here |
| citrullus lanatus subsp. vulgaris | Yes | subspecies | eukaryota | plants | subspecies | 260674 | click here |
| citrus | Yes | | | plants | genus | 2706 | click here |
| citrus aurantiifolia | Yes | species | eukaryota | plants | species | 159033 | click here |
| citrus aurantium | Yes | species | eukaryota | plants | species | 43166 | click here |
| citrus clementina | Yes | species | eukaryota | plants | species | 85681 | click here |
| citrus jambhiri | Yes | species | eukaryota | plants | species | 64884 | click here |
| citrus latifolia | Yes | species | eukaryota | plants | species | 200541 | click here |
| 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 maxima | Yes | species | eukaryota | plants | species | 37334 | click here |
| citrus nobilis | Yes | species | eukaryota | plants | species | 481549 | click here |
| citrus pseudogulgul | Yes | species | eukaryota | plants | species | 237572 | 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 |
| cladanthus arabicus | Yes | species | eukaryota | plants | species | 99040 | click here |
| cladium mariscus | Yes | species | eukaryota | plants | species | 241641 | click here |
| cladonia | Yes | | | plants | genus | 5199 | click here |
| cladonia arbuscula | Yes | species | eukaryota | plants | species | 174044 | click here |
| cladonia foliacea | Yes | species | eukaryota | plants | species | 184101 | click here |
| cladonia pocillum | Yes | species | eukaryota | plants | species | 387913 | click here |
| cladonia rangiformis | Yes | species | eukaryota | plants | species | 174068 | click here |
| cladonia symphycarpa | Yes | species | | | species | 174078 | 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 | Yes | | | plants | genus | 3452 | click here |
| clematis brevicaudata | Yes | species | eukaryota | plants | species | 748691 | click here |
| clematis japonica | Yes | species | eukaryota | plants | species | 231650 | click here |
| clematis ligusticifolia | Yes | species | eukaryota | plants | species | 3454 | click here |
| clematis paniculata | Yes | species | eukaryota | plants | species | 384955 | click here |
| clematis terniflora var. mandshurica | Yes | varietas | eukaryota | plants | varietas | 748703 | click here |
| clematis virginiana | Yes | species | eukaryota | plants | species | 743734 | click here |
| clematis vitalba | Yes | species | eukaryota | plants | species | 37490 | click here |
| clinacanthus nutans | Yes | species | eukaryota | plants | species | 714457 | click here |
| clinopodium nepeta | Yes | species | eukaryota | plants | species | 306383 | click here |
| clinopodium polycephalum | Yes | species | eukaryota | plants | species | 751808 | click here |
| coccoloba uvifera | Yes | species | eukaryota | plants | species | 45179 | click here |
| coccus viridis | Yes | species | eukaryota | invertebrates | species | 589264 | click here |
| cochlearia officinalis | Yes | species | eukaryota | plants | species | 270110 | click here |
| cocos nucifera | Yes | species | eukaryota | plants | species | 13894 | click here |
| codium | Yes | | | plants | genus | 3132 | 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 | Yes | | | plants | genus | 13442 | click here |
| coffea arabica | Yes | species | eukaryota | plants | species | 13443 | click here |