Common Sea-lavender 
Common Soapwort 
Common Swamp Pitcher-Plant 
Coppery Mesemb 
Coral Bells 
Cornulaca monacantha 
Cotton Bush 
Cowherb 
Cowherb 
Cretan catchfly 
Cumulopuntia boliviana 
Cumulopuntia leucophaea 
Cumulopuntia sphaerica 
Curly Dock 
Cushion buckwheat 
Cylindropuntia fulgida 
cylindropuntia spinosior 
Davis' knotweed 
Deltoid-leaved Dewplant 
Deptford Pink 
Desert rhubarb 
Desert trumpet 
Devil Cholla 
Devil's thorn