Native, warm season, perennial, erect, tufted herb to 2 m tall. Leaves are strap-like (to 60 cm long and 2 cm wide), laterally flattened, soft and hairy. Flowerheads are spikes to 1 m long. Flowers are each subtended by a bract, which almost as long as the flower and becomes reflexed at anthesis. Perianth is yellow, with an outer hairy surface; outer whorl c. 12–15 mm long and 10 mm wide; inner whorl c. 8 mm long and 2 mm wide. Stamens 1. Flowering is from spring to autumn. Widespread on the edges of dams, streams and swamps; in permanently water logged soils and water to about 60 cm deep; mostly coastal. Seeds are buoyant and spread by water. A low to moderate quality feed that is eaten by stock, but not highly sought after. Unconfirmed reports that it may cause poisoning under some circumstances. Fruits and tubers are eaten by waterbirds.
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