Tree, up to 30 m high, 1 m diam., often with buttresses, with pale reddish brown bark peeling off in very thin papery scales. Leaves elliptic to ovate, ca 20-25-nerved, 15-40 by 10-35 cm, on young trees and saplings narrower, ca 30-35-nerved, 50-100 by 25-50 cm, with rounded to obtuse apex, rounded base, and undulate to slightly dentate margin. Petiole 4-8 cm long, on young trees and saplings up to 10 cm, with half-obcor-date, rarely oblong, caducous wings. Wings usually broadening towards the apex, the apex rounded, extending distinctly above its insertion, at the basis 6-10, near the apex up to 35 mm broad. Raceme 4-7-flowered, up to 8 cm long with tortuous axis. Flowers probably never quite expanding, the sepals only slightly diverging, the petals falling off without spreading. Sepals 5, ca 30-40 by 25-40 mm. Petals yellow, cucullate when falling, 25-45 by 12-25 mm. Stamens ca 185-250, 13-24 mm long (but in a single flower all of approximately the same length), with a 1-2 mm long, acute acumen above the anthercells. Carpels 10-15, ca 10-15 by 2-3 mm, with 11-15 mm long styles, each with ca 25 ovules. Fruit dehiscent. Carpels 25-35 by 16-24 mm, one-seeded. Seeds 6 by 5 mm, black, enclosed by a rather thick fleshy aril.
A canopy tree in dense primary forest growing on dry or temporarily flooded soil; usually found at low elevations, though once collected at around 2,000 metres.
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In primary forest at low altitudes, on dry or temporarily flooded soil, once collected at ca 2000 m (Fig. 9).
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