caltrops, Tribulus terrestris 蒺藜
Canadian waterweed, Elodea canadensis 加拿大伊乐藻
canary-grass, Phalaris canariensis 草
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cannabis; hemp, Cannabis sativa 大麻
capeweed, Arctotheca calendula 金盏草
castor-oil plant, Ricinus communis 蓖麻
celandine, lesser, Ranunculus ficaria 榕叶毛茛
greater, Chelidonium majus 白屈菜
chamomile (mayweed), corn, Anthemis arvensis 田春黄菊（五月草）