Shrub 0.5-3 m, entirely villous, the hairs often multicellular, especially in the inflorescence; long inflated aerophores arising from submerged, buried roots. Leaves lanceolate to broadly lanceolate, 4-12 by 0.3-1.5 cm, narrowly cuneate at base, apex acute to acuminate; nerves 12-22 pairs; submarginal vein not prominent; petiole 3-12 mm. Flowers in upper leaf axils. Bracteoles lacking or up to 7 mm long, subulate. Sepals 4 or 5, lanceolate, irregularly serrulate, 10-18 by 4-8 mm, villous. Petals bright yellow, veiny, suborbicular, 15-24 by 16-26 mm, shallowly emarginate, with a claw 1-3 mm. Stamens 8 or 10, subequal; filaments 2-3.5 mm; anthers 3-4.5 mm long, extrorse and not shedding pollen directly on the stigma at anthesis. Pollen shed in tetrads. Disk elevated 1-2 mm, with a depressed densely white-hairy nectary around the base of each epipetalous stamen. Style c. 1 mm; stigma broadly elongate-hemispherical, 2-3 mm high. Capsule villous, 1.2-3 by 0.6-1 cm, light yellowish brown with 4 prominent dark brown ribs, 4-angled, thin-walled, readily and irregularly loculicidal; pedicel 2-4.5 cm. Seeds pluriseriate in each cell, free, light brown, finely striate and cellular pitted, obovoid, 0.6-0.8 mm long; raphe ¼ to Vs the width of the body. Gametic chromosome number (Old World populations), n = 40.
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Shrub, mostly erect, usually 0.5–3 m high, hirsute. Occasionally with long inflated pneumatophores arising from submerged or buried roots. Leaves alternate, ovate to lanceolate-elliptic, c. 4–12 cm long (in Australia), acute to acuminate, narrowed at the base, subsessile. Flowers solitary in upper leaf axils; bracteoles lanceolate to oblanceolate, on ovary base or upper pedicel. Sepals 4 or occasionally 5, lanceolate and irregularly serrulate. Petals c. 1–2.5 cm long, yellow. Stamens 8 or 10. Capsule sharply 4-angled, 1–2 cm long, readily and irregularly dehiscent. Seeds in each locule in several rows, free.
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