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Perennial amphibious or submerged aquatic herb. Stem rounded, rooting at the nodes, 10–130 cm long. Leaves narrow, opposite, sessile and succulent, 4–24 mm long. Small white flowers with four petals on long stalks arising from the upper leaf axils. The flowers are always above water. Fruits are follicles containing 2–5 elliptical and smooth seeds.
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