Common dog-violet 
Common Middle East Willow 
Common Passionfruit 
Common St John's wort 
Copperleaf 
Coralbush 
Corkystem Passionflower 
Corn Spurge 
Costa Rican St. John’s Wort 
Cow's Horn 
Creeping St. John's-wort 
Crowberry-leaved St.-John's-Wort 
Crown-of-Thorns 
Cuban Buttercup 
Cumberland Spurge 
Cup Saucer Plant 
Curled-leaved St. John's-wort 
Cypress spurge 
Dappled Willow 
Dogs mercury 
Downy yellow violet 
Dune Pansy 
Dwarf Spurge 
Dwarf St. John's-wort