Cattleya rex 
Cattleya violacea 
Cavendish Banana 
Cenchrus ciliaris 
Cenchrus pedicellatus 
Centipede Grass Orchid 
Central Australian cabbage palm 
Centropodia forskaolii 
Century plant or maguey 
Cephalanthera epipactoides 
Cephalanthera kurdica 
Cerulean Flaxlily 
Chamaedorea costaricana 
Chan's Coelogyne 
Charming Dendrobium 
Charming Paphiopedilum 
Cheatgrass 
Checkered Rattlesnake Plantain 
Cherokee Sedge 
Chilean wine palm 
Chinese Evergreen 
Chinese Fan Palm 
Chinese Ground Orchid 
Chinese Lily