Noun | 1. American watercress - mat-forming perennial found in cold springs of the eastern United StatesCardamine rotundifolia, mountain watercresswatercress - any of several water-loving cresses | | 2. American watercress - of southwestern Europe; cultivated in FloridaAmerican cress, Barbarea praecox, Barbarea verna, Belle Isle cress, early winter cress, land cressBarbarea, genus Barbarea - biennial or perennial herbs of north temperate regions: winter cressSt. Barbara's herb, winter cress, scurvy grass - any plant of the genus Barbarea: yellow-flowered Eurasian cresses; widely cultivated for winter salad |