Calamintha

Callirhoe

Campanula

Candle Larkspur

Cardinal Flower 

Carpathian Bellflower

Carpet Weed

Catchfly

Catmint 

Centaurea

Chamaelirium

Cheddar Pinks

Chelone

Chinese Globeflower 

Clematis

Cliff Maids

Clustered Bellflower

Columbine 

Coneflower 

Convallaria

Coral Bells 

Coreopsis 

Coyote Mint

Cranesbill 

Creeping Phlox 

Creeping Speedwell

Crocosmia