Cliff Schiedea          

Cliffface Catchfly          

Cliftons Eremogone          

Climbing Alsinidendron          

Clokeys Catchfly          

Clusterhead          

Coastal Plain Nailwort          

Colorado Starwort          

Columbian Stitchwort          

Common Catchfly          

Common Chickweed          

Common Corncockle          

Common Mouse-ear Chickweed          

Coral Necklace          

Corn Spurry          

Corncockle          

Corrigiola          

Cow Soapwort          

Crater Lake Sandwort          

Creeping Babys-breath