Tree to 36 m, girth to 1.5 m. Branchlets terete, lenticellate, puberulous, glabrescent. Stipules triangular, acute, rigid, 1-2 mm, caducous. Leaves: petiole 1.2-2 cm, sparsely puberulous, with a gland 1 mm below the junction of the pinnae, sub-stipitate to stipitate, circular, concave, c. 0.5-1 mm high, 0.5 mm in diameter; pinnae 1 pair, 3.5-10.5 cm, sparsely puberulous, with glands below the junctions of the petiolules, stipitate, raised, circular in outline, c. 1 mm high, 0.5 mm in diameter; leaflets 2 or 3 pairs per pinna, opposite, chartaceous, asymmetrically ovate to elliptic, (3—)5—15 by 2.8-7.2 cm; base ± symmetrically broadly cuneate, apex acuminate, both surfaces glabrous but lower with scattered glandular hairs, main vein central. Inflorescence composed of pedunculate umbels, densely puberulous, terminal or axillary; peduncle 1.8-3.5 cm, umbel consisting of c. 10-15 pedicellate flowers. Flowers dimorphic, pentamerous, bisexual, yellowish; pedicel 3-5 mm. Calyx campanulate, puberulous in the distal part, 2.5-3.5 mm; teeth triangular, acute, 0.5-0.8. Corolla funnel-shaped, puberulous toward the base, 8-9 mm; lobes ovate to elliptic-oblong, acute, 3-4 mm. Stamens c. 20 mm, tube equalling the corolla tube. Ovary sessile, glabrous, c. 3 mm. Pod blackish, woody, contorted into a circle or a very short spiral, the ventral suture forming the outer margin, 7-9 cm in diameter, segmented, segments one-seeded, triangular, 2.4-4 cm wide, 2.2-2.5 cm long in the outer part, indehiscent. Seeds black, ovoid, flattened, irregular, 16-18 by 13-14 by 7-8 cm; areole horseshoe-shaped, 1.5-2 mm, only upper pleurogram continuous between both faces of the seed, lower discontinuous.
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