Canada Mayflower 
Canada onion 
Canary Islands dragon tree 
Candle Orchid 
Caribbean Agave 
Caribbean False Helmet Orchid 
Caruncle Bearing Lepanthes 
Cat-face orchid 
Catasetum ochraceum 
Catasetum saccatum 
Cattleya maxima 
Cattleya purpurata 
Cattleya rex 
Cattleya violacea 
Centipede Grass Orchid 
Century plant or maguey 
Cephalanthera epipactoides 
Cephalanthera kurdica 
Cerulean Flaxlily 
Chan's Coelogyne 
Charming Dendrobium 
Charming Paphiopedilum 
Checkered Rattlesnake Plantain 
Chinese Ground Orchid