- common watercress, Rorippa nasturtium-aquaticum, Nasturtium officinale - perennial Eurasian cress growing chiefly in springs or running water having fleshy pungent leaves used in salads or as a potherb or garnish; introduced in North America and elsewhere
--1 is a kind of watercress
--1 is a member of Nasturtium, genus Nasturtium