Calamus
Calcareous Cryptantha
Calico Aster
California Amaranth
California Nettle
California Oatgrass
Campsis
Canada Bluegrass
Canada Cocklebur
Canada Germander
Canada Goldenrod
Canada Lettuce
Canada Mayflower
Canada Thistle
Canada Toadflax
Canada Wildrye
Canadian Anemone
Canadian Blacksnakeroot
Canadian Clearweed
Canadian Gooseberry
Canadian Honewort
Canadian Horseweed
Canadian Lousewort
Canadian Milkvetch
Canadian Rush
Canadian Waterweed
Canadian White Violet
Canadian Wildginger
Canadian Woodnettle
Canarygrass
Candle Anemone
Capsella
Caraway
Carelessweed
Carolina Anemone
Carolina Draba
Carolina Foxtail
Carolina Geranium
Carolina Horsenettle
Carolina Larkspur
Carolina Mosquitofern
Carolina Poplar
Carolina Puccoon
Carpet Phlox