Tree, up to 30 m high. Trunk 40-60 cm in diam. Bark superficially fissured, yellowish to greenish grey, inner bark pale brown to pale orange, wood pale yellowish to reddish brown; branches reddish brown, youngest, herbaceous shoots minutely papillose. Leaves obovate, obovate-lanceolate or lanceolate, petiole 0.7-1 cm long, blade 2.5-10 by 1.2-6 cm, margin entire, base gradually tapering into petiole, apex usually long acuminate, rarely subobtuse to emarginate, 5 or 6 primary nerves on each side of midrib (following the pattern of Ehretia), glabrous on upper and lower side. Inflorescences terminal, paniculate to thyrsoid-paniculate, with short peduncle, rhachis densely pubescent, flowers numerous; pedicels 2-8 mm long, densely pubescent. Calyx cam-panulate, 1.8-2 mm long, 1.8 mm wide, lobes free for 3/4 of calyx length, ovate to triangular, acute, sometimes imbricate, with few hairs along the margin. Corolla yellow, rarely red, tube shorter than calyx, lobes explanate, c. 5 by 1.8-2 mm, obovate-oblong, broadly rounded. Stamens inserted at upper end of tube, filaments filiform, about thrice as long as anthers, anthers basifixed, linear, bilobed at base, dehiscent longitudinally, obtuse. Pistil: styles 2, 3-4 mm long, filiform, stigmas indistinct; ovary sitting on an ovoid, sterile disc. Fruit single, broadly winged, wing suborbicular to obovate in outline, 3-4.5 cm in diam., fertile locules 2, oblong, 1.3-2 cm long, laterally compressed, wing densely radially veined, slightly emarginate to deeply bifid at apex, continuous also below locules; only the big, pendulous ovule developing into a seed. Fig. 18.
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A medium sized tree. It can grow 37 m tall. The crown is bushy and open. The trunk is straight and cylinder shaped. It is 60 cm across. The bark is smooth or has shallow cracks. The leaves are simple and alternate. They are broadly oval and 3-10 cm long by 1-4 cm wide. The flowers are in branched panicles at the ends of the branches. The flowers are bright yellow. The fruit are flat, winged and dry with one seed. The fruit are 5 cm across.
Scattered, but locally common, in well-drained, primary or secondary, lowland and hill forest. Undisturbed mixed dipterocarp, keranga and secondary forest up to 1,500 metres. Mostly on hillsides and ridges, but also along rivers and in swamps.
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A tropical plant. It grows in well-drained soil and in lowland forest. It grows up to 1,500 m above sea level.
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