Scandent shrub. Young branchlets subglabrous or sparsely and minutely puberulous, glandular or not, soon yellow-brown and then grey. Prickles deflexed, scattered, arising from narrow brown longitudinal bands usually darker than the intervening ones. Leaves: petiole normally 1.5–3.5 cm. long, with a flat or rather convex gland 1–4.5 mm. long and 0.5–1.5 mm. wide; pinnae (10–)15–27(–36) pairs, (0.8–)1.5–4.5 cm. long; glands on rhachis between the top 3–10 pairs; leaflets linear, very numerous, 0.3–0.8 mm. wide, glabrous or very inconspicuously ciliolate, midrib nearer one margin at base. Flowers white, in small heads 4–8 mm. in diameter in ample panicles. Stipules at base of peduncles small, 0.3–0.75 mm. wide, inconspicuous, soon caducous, not subcordate at base. Calyx eglandular outside. Pods (Fig. 15/25, p. 66) subcoriaceous, oblong, brown or pale brown, flat, dehiscent, 8–14 cm. long, 1.7–2.8 cm. wide, margins not strongly thickened. Seeds dark brown, smooth, elliptic, compressed, 7–11 mm. long, 5–8 mm. wide; areole small, 4–5 mm. long and 1.5–2.5 mm. wide.
