| Chloris truncata |
| Chlorophytum comosum 'Ocean' Ampellilja |
| Chlorophytum comosum 'Variegatum' Ampellilja |
| Chlorophytum orchidastrum 'Green Orange' Kamerunlilja |
| Chrysophyllum oliviforme |
| Cichorium endivia 'Bianca di Napoli' Escarolesallat |
| Cichorium intybus Cikoria |
| Cichorium intybus 'Di Bruxelles' Cikoriasallat |
| Cichorium intybus 'Hilmar' Sallatscikoria |
| Cichorium intybus 'Palla Rossa' Rosensallat |
| Cichorium intybus 'Yellora' Cikoriasallat, drivcikoria |
| Cinchona pubescens |
| Cinnamomum daphnoides |
| Cinnamomum verum Äkta kanel |
| Cirrhaea dependens |
| Cissus amazonica |
| Cissus discolor |
| Cistanthe grandiflora Stor sidenblomma |
| Cistus creticus Kretacistros |
| Cistus crispus |
| Cistus laurifolius Lagercistros |
| Cistus populifolius Poppelcistros |
| Citrus australasica |
| Citrus hystrix Papeda |
| Citrus maxima Pompelmus |
| Citrus microcarpa Kalamondin |
| Clarkia pulchella Fjärilsclarkia |
| Clarkia unguiculata Clarkia |
| Cleisostoma simondii |
| Cleistocactus brookeae |
| Cleistocactus laniceps |
| Cleistocactus winteri Bronskaktus |
| Clematis 'Carmencita' Klematis |
| Clematis 'Etoile Rose' Texensis klematis |
| Clematis 'Multi Blue' Klematis |