Unbuttressed tree to 26 m high; bole often crooked, up to 12 m high, 40 cm in diameter. Branchlets terete, greyish to brownish with pale lenticels, glabrous or very scarcely puberulous. Leaves: petiole 1.1-8.5 cm, glabrous; usually with 2 glands, circular or elliptic, usually raised, flat or slightly depressed in the central part, 0.5-2(-3) mm in diameter; pinnae 1 pair, 2.8-13.3 cm, glabrous or scarcely puberulous; petiolules 2-5 mm, glabrous; leaflets (l-)2-4 pairs per pinna, opposite (proximal pair sometimes subopposite), chartaceous, drying glossy bright green with straw veins, ± unequal-sided, ovate or obovate-elliptic, oblanceolate, or lanceolate, (4-)5-17.5 by (1.8-)2.3-8.5 cm, base ± cuneate or subattenuate, often asymmetric, apex obtusely acuminate; principal lateral veins 5-9 per leaflet-half, parallel, ± straight; reticulation prominent and dense, both surfaces glabrous. Inflorescences terminal or axillary at the distal leaves, glabrous or with a few scattered hairs only, consisting of pedunculate glomerules aggregated into panicles to 40 by 50 cm; glomerules composed of 4 or 5 sessile or subsessile flowers; floral bract elliptic-oblong, acute, 0.5-1 mm long, glabrous. Flowers pentamerous, bisexual. Calyx greenish white, membranous, cup-shaped or campanulate, 1.5-2.5 mm long, glabrous, ± deeply 2-lobed, teeth irregular, triangular, acute or apiculate, 0.2-0.5 mm. Corolla greenish white, membranous, funnel-shaped, (4-)5-5.5 mm long, glabrous, lobes 4 (or 5), ± narrowly elliptic to lanceolate, acute, reflexed, c. 2-2.5 mm. Stamens white, 8 mm long, tube exceeding the corolla-tube. Ovary solitary, glabrous. Pod orange or red outside, becoming brown when old, reddish inside, loosely twisted, sinuate between the seeds, rigidly charta-ceous-coriaceous, c. 15-20 by 1.8-2.4 cm, glabrous, swollen over the seeds, veins inconspicuous, dehiscing first along the ventral suture. Seeds purplish black, ellipsoid, up to 16 by 12 by 10 mm, slightly flattened.
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