Tree to 35 m tall; stem buttressed. Leaves rusty-sericeous when young, glabrescent; stipules broadly ovate, mostly 3-4 mm long, 2-3 mm wide, overlapping and enclosing the terminal bud, rusty-sericeous outside; petiole 2-6 cm long; rachis 2-11.5 cm long; leaflets 3 or 5; petiolules 5-15 mm long. Lamina obovate-elliptic or obovate-oblong, 6.5-21 cm long, 2.5-9.7 cm wide; base cuneate; margins entire but slightly undulate. Inflorescence 15-25 cm long, much-branched, rusty-sericeous when young, glabrescent. Sepals 5, broadly ovate, 5-8 mm long, 3-6 mm wide, rusty-sericeous, reflexed at anthesis. Stamens 5 or 6, alternating with the petals; filaments 0.8-1.2 mm long, glabrous; anthers 4-5 mm long. Fruit elliptic-oblong, 5-11 cm long, 2.8-4 cm wide, brown, glabrous, apparently tardily dehiscent on the forest floor; wing 6-9 mm wide. Seeds irregularly reniform, 7-10 mm long, 10-16 mm wide, pale chestnut brown.
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