- Cabbage
- Cabbage palm
- Cabbage thistle
- Cabbage tree
- Caisin
- California lomatium
- California wild grape
- Canada Violet
- Canaigre
- Cape aloe
- Caper
- Caraway
- Cardoon
- Cassava
- Catsear
- Cauliflower
- Celtuce
- Century plant
- Ceylon ironwood
- Cha-phlu
- Charlock
- Chayote
- Cheeseweed
- Chick pea
- Chicory
- Chinese arrowroot
- Chinese Boxthorn
- Chinese Cabbage
- Chinese Cucumber
- Chinese Hackberry
- Chinese Hibiscus
- Chinese Kale
- Chinese Mahogany
- Chinese Motherwort
- Chinese onion
- Chinese Pistache
- Chinese potato
- Chinese radish
- Chinese Rampion
- Chinese Savoy
- Chipilín
- Cicely
- Cinnamon fern
- Clary
- Clearweed
- Coco de mer
- Coconut
- Codlins And Cream
- Coffee Senna
- Colewort
- Coltsfoot
- Colza
- Common blue violet
- Common Borage
- Common Chickweed
- Common daisy
- Common Day Lily
- Common Day-flower
- Common evening primrose
- Common Hoarhound
- Common hogweed
- Common hollyhock
- Common Lime
- Common lomatium
- Common Milkweed
- Common purslane
- Common Reed
- Common Rue
- Common Sauropus
- Common Screw Pine
- Common Thyme
- Common wood sorrel
- Common yarrow
- Common yellow woodsorrel
- Coriander
- Corn Chrysanthemum
- Corn Poppy
- Corn Salad
- Corncockle
- Cowslip
- Cranberry hibiscus
- Creeping Rockfoil
- Creeping thistle
- Creeping woodsorrel
- Cress
- Crested wartycabbage
- Crow garlic
- Crown Daisy
- Cuban Bast
- Cuban oregano
- Cuckoo flower
- Cucumber
- Curled Dock
- Cutleaf Ground Cherry
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