Cabbage
Calicoflower
California Amaranth
California Blackberry
California Butterwort
California False Hellebore
California Hesperochiron
California Indian Potato
California Nettle
California Oatgrass
California Waterwort
Camas
Campion
Canada Bluegrass
Canada Cocklebur
Canada Germander
Canada Goldenrod
Canada Lettuce
Canada Mayflower
Canada Thistle
Canada Wildrye
Canadian Anemone
Canadian Gooseberry
Canadian Horseweed
Canadian Milkvetch
Canadian Waterweed
Canadian White Violet
Canary Violet
Canarygrass
Cancerwort
Candle Anemone
Candytuft
Canterbury Bells
Cape-ivy
Capitate Sedge
Capsella
Caraway
Carelessweed
Carolina Bugbane
Carolina Draba
Carolina Foxtail
Carolina Geranium
Carpet Phlox
Carpetweed