Shrubs or trees, 4-30 m tall. Leaves: petioles 2.5-17 cm long, slightly winged near lamina; lamina obovate-oblong to oblong, 10-45 by 4-10 cm, chartaceous, base cuneate, confluent onto petiole, margin shallowly serrate-crenulate, flattish, apex cuspidate or caudate, acumen 5-25 mm long, lower surface glabrous; midrib prominulous above, prominent beneath, primary veins 14-18(-21) pairs, brochidodromous, merging through network of veins 2-4 mm from margin, plane or impressed above, prominent beneath, intercostal veins prominulous on both surfaces, reticulate. Inflorescences terminal or ramiflorous spikes, pendulous with c. 60 flowers, 10-75 cm long; rachis thick, 5-8 mm diam., accrescent to 10 mm, glabrous; bracts triangular, lanceolate, 5-11 by 1.5-3 mm. Calyx open in bud. Flowers sessile; hypanthium tetragonous, 4-6 mm long, glabrous; petals pinkish red crimson or striped red; stamens pink or deep red, staminal whorls 4-5, the inner one staminodal, staminal tube 1.5-3 mm high, staminodia c. 7 mm; disc a distinct thin grooved ring, 0.5-1.5 mm high; ovary 4-locular, 2-4(-6) ovules per locule; style 4-4.5 cm long. Fruits obovoid, tetragonous, 5.5-9 by 2-4 by 2-3.5 cm, at most with 4 ribs, mostly with convex sides, dull. Seeds single, ovoid, 3-4.5 cm long.
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A broad tree. The leaves are sword shaped and have teeth along the edge. They are pale on the upper side. They are 25 cm long. The flowering stalks are long. The fruit are oblong. The seeds are 2.5 cm across.
Rainforest, in both dense primary and the more open secondary formations, growing on hills, along rivers, or in periodically inundated or swampy areas, mostly on sand or loam, at elevations from sea-level to 700 metres, occasionally to 1,300 metres.
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It is a tropical plant. It grows from sea level to 700 m above sea level or higher. It grows in swampy areas and along rivers. In XTBG Yunnan.
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