Watercresses (Nasturtium officinale, N. microphyllum; formerly Rorippa nasturtium-aquaticum, R. microphylla) are fast-growing, aquatic or semi-aquatic, perennial plants native from Europe to central Asia, and one of the oldest known leaf vegetables consumed by human beings.
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watercress An edible aquatic or semi-aquatic perennial plant of the species Nasturtium officinale in the Brassicaceae family.