Cabbage Palmetto
Cabbagebark Tree
Caesarweed
Cajanus
Cajeput Tree
Caladium
Calcareous Morning-glory
Calcium-hating Sedge
Caley Pea
Calibrachoa
Calico Aster
Calicoplant
California Bulrush
California Fan Palm
California Privet
Callery Pear
Calloose Grape
Calophyllum
Caltrop
Calycocarpum
Calyptocarpus
Camellia
Camphor Daisy
Camphor Pluchea
Camphortree
Camphorweed
Campsis
Canada Cocklebur
Canada Germander
Canada Goldenrod
Canada Lettuce
Canada Spikesedge
Canada Toadflax
Canadian Blacksnakeroot
Canadian Clearweed
Canadian Honewort
Canadian Horseweed
Canadian Lousewort
Canadian Rush
Canadian Waterweed
Canadian Woodnettle
Canary Island Date Palm
Canarygrass
Cancer-root