Coelogyne radioferens 
Coelogyne rhabdobulbon 
Coelogyne rochussenii 
Coelogyne septemcostata 
Coelogyne swaniana 
Coelogyne venusta 
Colchicum bivonae 
Colchicum peloponnesiacum 
Cold-growing cymbidium 
Comet orchid 
Common Bluebell 
Common gnat orchid 
Common hyacinth 
Common leek orchid 
Common potato orchid 
Common snout orchid 
Common snowdrop 
Common Spotted-orchid 
Common Twayblade 
Comparettia falcata 
Comper's Orchid 
Cone-Flower Dendrobium 
Cooktown Orchid 
Copper Iris