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wintercress

British  
/ ˈwɪntəˌkrɛs /

noun

  1. a bitter-tasting yellow-flowered perennial, Barbarea vulgaris, somewhat resembling mustard

  2. a commercial hybrid, Rorippa × sterilis, between watercress and R. microphylla

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Some are very old cultivated varieties, as the wintercress, or Barbarea vulgaris.

From Project Gutenberg