Aquatic, glabrous; root fibrous. Stems: stout, hollow, rooting at the decumbent base. Leaves: pinnate, leaflets rounded or elongated, the terminal ones largest. Flowers: petals white; sepals four, early-falling; stamens six; style short, thick. Fruit: pods divaricately spreading, seeds in two rows. Not indigenous.
Surely it is a libel to call this plant Nasturtium, which signifies "twisted nose," and is given to Water Cress simply because we are supposed to turn up our noses when we eat its acrid leaves. Those who go out to gather flowers will seldom pause to pick this insignificant plant, whose clusters of small white flowers grow close beside, or actually in, the streams and ponds, and whose only claim upon our attention lies in the pleasant pungent flavour of its leaves. This is an introduced plant.