Christmas Cactus 
Christmas Cholla 
Cistanthe picta 
Claytonia sibirica 
Cliff Maids 
Climbing Sundew 
Clove Pink 
Coast bonefruit 
Coast Jointweed 
Coastal Pigface 
Cockscomb 
Columbian lewisia 
Cometes abyssinica 
Cometes surattensis 
Commicarpus plumbagineus 
Commicarpus sinuatus 
Common catchfly 
Common chickweed 
Common Corncockle 
Common fishhook cactus 
Common Glasswort 
Common iceplant 
Common knotgrass 
Common Leadwort