Tree up to 25 m high, girth to 2 m. Branchlets terete, puberulous in the distal parts, glabrescent. Leaves: rachis 1-11.5 cm, scarcely puberulous or glabrous, glands circular to elliptic, ± sunken with strongly raised margin, 1-5 mm; pinnae 1 or 2 pairs, 3—14(—17) cm, scarcely puberulous or glabrous; petiolules c. 5 mm, puberulous or glabrous; leaflets (2 or) 3 (or 4) pairs per pinna, opposite, chartaceous, drying dark green above, light green beneath, with yellowish veins (juvenile foliage rusty red), ± equal-sided, ovate-elliptic, elliptic, or lanceolate, 2-12(-15.5) by 0.7-6.5, base ± symmetrically narrowly cuneate to rounded, apex obtuse with acuminate tip to subcaudate, young leaflets with ± dense cover of reddish glands beneath, when old with scattered glands near the main vein only, upper surface glabrous; principal lateral veins 6 or 6 per leaflet-half, oblique or slightly arching, non-parallel; reticulation dense and raised on both surfaces. Inflorescences terminal and axillary at the distal leaves densely puberulous, consisting of pedunculate glomerules aggregated into panicles, 8-10 by 4-6 cm; glomerules consisting of 10-15 sessile flowers; floral bracts narrowly lanceolate, acute, c. 1 mm, sericeous. Flowers pentamerous, bisexual. Calyx campanulate, 2-2.2 mm, densely puberulous or sericeous, teeth triangular or deltoid, acute, 0.3-0.5 mm. Corolla narrowly campanulate, 5-5.5 mm, densely puberulous or sericeous; lobes lanceolate, acute, 3 mm. Staminal tube equalling the corolla-tube. Ovary solitary, glabrous. Pod brownish and rugulose outside, reddish inside, curved into a circle, 5.5 cm in diameter, valves 2-2.3 cm wide, scarcely or strongly sinuate, coriaceous-woody, glabrous, with inconspicuous veins, dehiscing first along the ventral suture, contorted after dehiscence. Seeds black, probably ovoid and strongly flattened, c. 17 by 11 by 4 mm (not seen fully mature).
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