Synonyms for American Watercress (same or very similar meaning)
WordNet sense 1 (mat-forming perennial found in cold springs of the eastern United States):
Cardamine rotundifolia, mountain watercressWordNet sense 2 (of southwestern Europe; cultivated in Florida):
Belle Isle cress, American cress, Barbarea praecox, Barbarea verna, early winter cress, land cressFrom the ODE community, based on WordNetadd/edit