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Plant Form Mat-forming aquatic herb. Size Up to 90 cm high. Stem Rectangular, with lengthways grooves, and either hairless or hairy. Leaves Oval-shaped up to 9 cm long, on very short stalks and with pointed tips. Sparsely hairy, particularly on veins. Flowers Tubular white flowers in clusters of 10 or more. On very short stalks. Fruit and Seeds Narrowly oval-shaped capsule 6-8 mm long containing about 20 seeds. Habitat Wetlands, lakes, dams, ponds. Distinguishing Features Much larger plant than native Willow hygro (Hygrophila angustifolia).