Cabbage
Calamint
Calamus
Calico Aster
California Nettle
California Privet
Callery Pear
Caltrop
Camas
Campion
Campsis
Canada Bluegrass
Canada Cocklebur
Canada Germander
Canada Goldenrod
Canada Lettuce
Canada Lily
Canada Mayflower
Canada Thistle
Canada Toadflax
Canada Wildrye
Canadian Blacksnakeroot
Canadian Burnet
Canadian Clearweed
Canadian Honewort
Canadian Horseweed
Canadian Lousewort
Canadian Milkvetch
Canadian Rush
Canadian Serviceberry
Canadian Waterweed
Canadian Wildginger
Canadian Woodnettle
Canarygrass
Cancer-root
Cancerwort
Cankerweed
Capsella
Caraway
Cardinalflower
Carelessweed
Carolina Anemone
Carolina Desert-chicory
Carolina Elephantsfoot