Medium-sized or large buttressed tree. Bud, stipule outside, panicle and young twig pale greyish pubescent; fresh young leaves sparsely fugaceous pubescent beneath. Twig slender, dotted with large pale lenticels, with a minutely wrinkled striated papery flaked surface. Bud c. 2 by 1.5 mm, small, ovoid to conical. Stipule to 4 by 1.5 cm, hastate, pubescent. Leaves 7-12 by 3-5 cm, elliptic to oblong-lanceolate or ovate, coriaceous; base obtuse or cuneate, symmetrical or subequal; acumen to 1 cm long; margin generally slightly revolute; nerves 9-12 pairs, slender but distinctly elevated beneath, at c. 30°-50°; tertiary nerves scalariform, rather dense, oblique to the nerves; petiole 1-1.5 cm long, fairly stout. Panicle to 20 cm long, terminal or axillary, terete or angular, lax; regularly doubly or trebly branched, branchlets to 1 cm long, bearing to 8 flowers; bracteoles small, fugaceous. Flower bud to 3 mm long, small, elliptic to subglobose. Calyx shortly pubescent outside, glabrous within; lobes ovate, sub-equal, subacute, 2 inner lobes thinner towards margin, more constricted basally. Petals cream, linear, the basal half imbricate, forming a cup on opening, spreading and strongly twisted distally. Stamens 15, in 3 unequal verticils; filaments broad at base, tapering rapidly and filiform distally; anthers subglobose; appendage to connective as long as anthers and reaching almost to the style apex, sparsely ciliate towards the apex. Ovary subglobose, shortly pubescent; stylopodium as long as ovary, pubescent; style short, glabrous. Fruit sparsely pubescent; 3 longer calyx lobes to 6 by 1.2 cm, thinly coriaceous, spatulate, obtuse, 2.5 mm broad above the c. 3.5 mm broad thickened tuberculate base; 2 shorter lobes c. 4.5 cm long, narrower, with a narrower base. Nut to 15 by 5 mm, narrowly ellipsoid to subobovoid, shortly buff pubescent; style remnant short, acute.
An emergent tree in mixed dipterocarp forests, growing in well drained clay and sandy-clay soils on low hills and particularly ridge tops; usually at elevations from 150-700 metres, occasionally to 1,000 metres.
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Well drained clay soils on low hills and particularly ridge tops at 150-1000 m (mainly to 700 m).
Can be grown by seedlings. Seeds needs soaking.