winter cress

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various herbs of the genus Barbarea of the mustard family, having yellow flowers and deeply lobed edible leaves.

from The Century Dictionary.

• noun A cruciferous plant, either Barbarea vulgaris or B. præcox. both formerly (and the latter still sparingly) cultivated for winter salad.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun cress cultivated for winter salads
• noun any plant of the genus Barbarea: yellow-flowered Eurasian cresses; widely cultivated for winter salad