Source : WordNet®

American watercress
     n 1: mat-forming perennial found in cold springs of the eastern
          United States [syn: {mountain watercress}, {Cardamine
          rotundifolia}]
     2: of southwestern Europe; cultivated in Florida [syn: {Belle
        Isle cress}, {early winter cress}, {land cress}, {American
        cress}, {Barbarea verna}, {Barbarea praecox}]