• WordNet 3.6
    • n bittercress any of various herbs of the genus Cardamine, having usually pinnate leaves and racemes of white, pink or purple flowers; cosmopolitan except Antarctic
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In literature:

Cardamine impatiens (Narrow-leaved Bittercress) .
"Handbook to the Severn Valley Railway Illustrative and Descriptive of Places along the Line from Worcester to Shrewsbury" by J. Randall
For my part I say it is Hairy Bittercress.
"Punch, or the London Charivari, Vol. 158, April 14, 1920" by Various