Not Established

	Common name (English)
Cosmos bipinnatus	Cosmos; Mexican aster
Cossura coasta
Cota austriaca	Austrian chamomile
Cotinus coggygria	European Smoketree; Venetian Sumach
Cotyledon orbiculata var. oblonga
Crataegus germanica	Medlar
Crotalaria juncea	Indian hemp
Cryptostegia grandiflora	Indian rubbervine
Cucumis melo	Muskmelon, Humi melon
Cucumis sativus	Cucumber
Cucurbita argyrosperma subsp. argyrosperma	Cushaw
Cucurbita ficifolia	Asian pumpkin, Fig-leaved Gourd
Cucurbita foetidissima	Buffalo gourd
Cucurbita moschata	Squash, Pumpkin, Butternut Squash
Cucurbita pepo	Bitter Bottle Gourd; Vegetable Marrow; Acorn squash
Cupressus funebris	Chinese Weeping Cypress
Cupressus torulosa	Himalayan Cypress
Cutleria multifida
Cycas revoluta	Fern plant
Cyclopterus lumpus	Hen-fish; Lumpsucker; Lumpfish