bittercress

World English Dictionary
bittercress (ˈbɪtəˌkrɛs)
 
n
one of several perennial or annual plants of the genus Cardamine, that are related to lady's-smock, including hairy bittercress (C. hirsuta), a common weed resembling shepherd's purse, with which it is often confused: family: Brassicaceae (crucifers)

Collins English Dictionary - Complete & Unabridged 10th Edition
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WordNet
bittercress

noun
any of various herbs of the genus Cardamine, having usually pinnate leaves and racemes of white, pink or purple flowers; cosmopolitan except Antarctic 
WordNet® 3.0, © 2006 by Princeton University.
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