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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; 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 ❲Nasturtium officinale, Rorippa nasturtium-aquaticum❳ |