Tree (2-)20-25(-42) m, sometimes with buttresses up to 3-4 m high and 1.5 m out. Leaf rachis (3-)5—18(-21) cm, more or less hairy, 3-7(-9)-jugate; leaflets varying from small, coriaceous, and glabrous to large, herbaceous, and hirsute (mainly on the nerves), (sub)sessile, markedly decreasing in size towards the leaf-base, the basal leaflets attaining about half the length of the largest ones, 1.5-3 times as long as wide, widest at the middle or above, (1-)2—13.5 by (0.5-)1-4 cm; base narrowed, acutish to obtuse, top acutish to subacuminate; margin crenate or serrate sometimes from the base but at any rate towards the top; surface dull, underneath more or less densely set with golden yellow glandular scales. Dioecious. Catkins lateral on leafy and on slightly older twigs, the peduncles solitary in the leaf axil or serial by twos or threes. Male catkins in bundles of 2-3, sessile to 3 cm stalked, 3-10 cm long; perianth completely reduced or almost so; stamens (3-)5-7, sessile to 1/3 mm stalked, anthers sometimes unequal, 0.5-1 mm, sparsely hirsute, connective not or hardly protruding. Fruiting catkins 9-14 cm long in all, 2-5 cm stalked, rachis as thick as that of the leaves, shallowly grooved. Nut (sub)sessile, ± 3 mm diam., hispid, wing 1.5-1.25(-3.75) cm long with the nut, 5-10 mm wide; perianth lobes rather equal, often not adnate to the style, style about as long as the stigmas, the whole 2-4 mm long.
In undisturbed mixed dipterocarp, keranga and sub-montane forests up to 1,700 m altitude. On ridges and alluvial sites, usually on poor sandy soils. In secondary forests usually present as a pre-disturbance remnant tree.
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Primary dryland forest (rarely secondary forest) on sandy or clayey soil, from sea-level to 2200 m. In Malaya the leaves are shed at the end of a dry spell without fading into autumn tints (CORNER).
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