(n)tall biennial water hemlock of northeastern North America having purple-spotted stems and clusters of extremely poisonous tuberous roots resembling small sweet potatoes, Syn.spotted hemlock, spotted water hemlock
The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)
(Bot) (a) A poisonous umbelliferous plant (Cicuta virosa) of Europe; also, any one of several plants of that genus. (b) A poisonous plant (Œnanthe crocata) resembling the above. [ 1913 Webster ]