Tree to 40 m high; bole to 20 m high, girth c. 100 cm. Branchlets angular by ridges decurrent from the leaf-bases, brownish, dotted by red-brown lenticels, scarcely puberulous. Leaves: rachis 3-16 cm, ± puberulous, with 1-3 glands, narrow and slit-like to narrowly oblong-elliptic, with slightly raised margin and depressed central part, 2-10 mm; pinnae 1 pair, 6-14 cm, puberulous; petiolules 2-5 mm, puberulous; leaflets 2 or 3 pairs per pinna, opposite, coriaceous(-chartaceous), drying brown to green-brown, unequal-sided, elliptic-lanceolate or lanceolate, 4-15 by 2-7 cm, base asymmetrically cuneate, apex acuminate, sometimes mucronulate, upper surface glabrous except for the scarcely puberulous major veins, lower surface puberulous; principal lateral veins 6-10 per leaflet-half, non-parallel, arching; reticulation lax, raised but hardly visible above, prominent beneath. Inflorescences terminal, puberulous, consisting of pedunculate glomerules (or umbels) aggregated into panicles to 30 by 35 cm; glomerules consisting of c. 5 subsessile or sessile flowers, pedicel up to 1 mm; floral bracts ovate, acute, c. 1 mm, puberulous. Flowers pentamerous, bisexual, pale yellowish white or cream. Calyx narrowly cup-shaped, 3.5-4.8 mm, densely appressed-puberulous or sericeous; teeth deltoid, acute, 0.3-0.5 mm. Corolla funnel-shaped, 7-11.2 mm, densely appressed-puberulous or sericeous; lobes tri-angular-ovate or ovate-elliptic, acute, 2.5-5 mm. Stamens to 30 mm long, tube equalling or shorter than the corolla-tube. Ovary solitary, puberulous. Pod ferrugineous or chocolate-brown outside, apricot-red or orange within, spirally contorted, 14-25 by 1.5-2.2 cm, coriaceous-chartaceous, valves only slightly sinuate between the seeds, shortly tomentose, veins prominulous, dehiscing along both sutures. Seeds black, glossy, ellipsoid, slightly compressed, 15-16 by 8-12 by 6 mm.
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