Tree 15-45(-70?) m high, 20-80 cm dbh, fluted at base and forming tall buttresses up to 6 m high, spreading at the base up to 2 m away from the trunk. Bark smooth to slightly rough, scaly or both longitudinally and horizontally fissured, greyish, yellowish or dark brown; inner bark yellow or pale yellow, with copious white latex. Branchlets glabrous. Leaves in whorls of 4-7; petiole (5-)10-20(-28) mm long, without distinct intrapetiolar stipule at the base, widening or scale-like colleters in the axils; blade thinly coriaceous when dried, elliptic to narrowly elliptic or obovate, 3.5-10 by 1.5-4 cm, 1.6-3.4 times as long as wide, apex obtuse or rounded, sometimes shortly acuminate, base acute, obtuse or rounded, glabrous on both sides; 25-40 pairs of secondary veins, straight, forming an angle of 85-90° (mostly nearly 90°) with the midrib, 1-3 mm from each other; tertiary venation from the middle ramified, somewhat conspicuous above. Inflorescence 2.5-10 mm long, usually forming of two bunches of dense and many clustered flowers; pedicels 0-1 mm long, pubescent. Bracts and bracteoles ovate to broadly triangular up to 2 mm long, acute. Flowers fragrant. Sepals pale green, connate at the base for 0.3-0.5 mm, erect or slightly spreading, ovate to narrowly ovate, 1.5-2.1 by 0.6-1 mm, obtuse, puberulous or densely pubescent outside, glabrous or minutely pubescent around the apex inside, ciliate. Corolla lobes sinistrorse; yellow or pinkish, 8-10 mm long in the mature bud and forming an ovoid head, 2.5-3 by 0.8-1.1 mm, glabrous or only sparsely ciliate around the apex of the lobe margins outside; tube 6-7.5 mm long, 1-1.7 mm wide around the stamens; lobes ovate or lingulate, mostly slightly oblique, 2.6-4 by 1.3-2.8 mm, 1.1-2.5 times as long as wide, pilose at extreme base inside. Stamens inserted at 5-5.8 mm from the base; anthers ovate or triangular, 0.8-0.9 by 0.3-0.5 mm, obtuse. Pistil glabrous, 6-6.3 mm long; ovary ovoid or broadly ovoid, 0.8-1.1 by 0.7-1 mm, of 2 carpels, with or without a disk-like thickening at the base (up to 0.3 mm high); style 4.5-4.9 long; style head pagoda shape, 0.6-0.8 mm high, with a short and robust cleft stigmoid apical part 0.2-0.3 mm high. Fruit a pair of follicles, 25-35 cm by c. 1.5(-2) mm, glabrous. Seeds brown, oblong, 5-6 by 1 mm, ends rounded, glabrous on both sides, longest cilia 13-17 mm long.
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