Calamus
Calcareous Cryptantha
Calibrachoa
Calico Aster
California Amaranth
California Brome
California Bulrush
California Loosestrife
California Nettle
Caltrop
Calycocarpum
Camas
Camphor Pluchea
Camphorweed
Campsis
Canada Bluegrass
Canada Cocklebur
Canada Germander
Canada Goldenrod
Canada Lettuce
Canada Lily
Canada Spikesedge
Canada Thistle
Canada Toadflax
Canada Wildrye
Canadian Anemone
Canadian Blacksnakeroot
Canadian Clearweed
Canadian Honewort
Canadian Horseweed
Canadian Lousewort
Canadian Milkvetch
Canadian Waterweed
Canadian Wildginger
Canadian Woodnettle
Canarygrass
Cancerwort
Candle Anemone
Cane
Cantaloupe
Capsella
Cardinalflower
Carelessweed
Carolina Anemone
