Scandent shrub to 30 m. high. Young branchlets ± densely pubescent with fulvous hairs and many red-purple glands mixed, dark brown, later going blackish. Prickles deflexed, scattered, arising from longitudinal bands usually darker than the intervening ones. Leaves: petiole 1.5–3.5 cm. long; pinnae 7–19 pairs, 3–4.5(–5.5) cm. long; leaflets linear-oblong, 0.5–1.25 mm. wide, glabrous or margins sparsely and inconspicuously ciliolate, midrib nearer one margin at base. Flowers cream or white, in heads 10–15 mm. in diameter usually in pyramidal panicles. Stipules at base of peduncles small, 1–1.5 mm. wide, inconspicuous, soon caducous, not subcordate at base. Calyx puberulous and eglandular outside. Corolla puberulous outside. Pods (Fig. 15/26, p. 66) subcoriaceous, oblong, dark brown, dehiscent, 8–18 cm. long and 3–4.5 cm. wide, with margins 1–1.5 mm. wide and not very thickened. Seeds brown or black, smooth, elliptic, compressed, 9–12 mm. long, 6–7 mm. wide; areole small, 5–7 mm. long and 2.5–3.5 mm. wide.
