Tree up to 40 m high and c. 70 cm in diam. Stipules foliaceous, subintrapetiolar, falcate, up to c. 8 mm long, acuminate, rounded auriculate at base, reticulate and finely puberulous on both surfaces, early caducous. Leaves 3-or 4-jugate; petiole 2-2.5 cm and rachis c. 7 cm long, minutely puberulous, glabrescent. Leaflets coriaceous, elliptic or elliptic-oblong, rarely obovate, 4-7.5 by 2-3 cm, lower ones usually smaller than the upper ones; apex obtuse, the very tip slightly notched; base obtuse or rotund, often symmetric; upper surface glabrous; lower surface puberulous especially on the midrib; petiolules very short or subsessile, up to c. 2.5 mm, pubescent, glabrescent. Inflorescences paniculate, up to 15 cm long, lateral branches up to c. 7 cm long, both rachis and branches densely puberulous; bracts and bracteoles triangular, ovate, or lanceolate, 4-7 mm long, puberulous on both surfaces; pedicels subsessile or very short, up to 3 mm, puberulous. Calyx lobes broadly ovate, or lanceolate, 4-5.5 by 1.5-2.5 mm, puberulous outside and bearing some spiny outgrowths outside, puberulous inside. Petal slightly obovate or elliptic, c. 5 by 2.5 mm; puberulous outside and glabrous inside. Stamens: united basal parts of the filaments very short; free filaments up to c. 10 mm, slightly hairy at the lower part; fertile anthers various in size, the larger ones ovoid-ellipsoid, c. 2.5 mm long, the others smaller. Ovary sessile, subrhomboid, c. 5 mm long, densely hairy, with numerous minute, spiny outgrowths, 2-4-ovuled; style up to c. 10 mm, recurvate, glabrous or sparsely hairy in the basal part; stigma small, capitate. Pods on a very short peduncle, ovoid or broadly ellipsoid, or suborbiculate, 4-6.5 by 3.5-6 cm, flattened, covered with close, hard, straight spines (up to c. 4 mm); beak curvate, c. 8 mm long; 1-or 2-(or 3-)seeded. Seeds arillate.
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