Arborescent or scandent shrub up to 5 m. high. Young branchlets densely pubescent or puberulous, eglandular. Prickles scattered, recurved; leaves often large. Leaves: petiole about 1.8–3.2 cm. long; pinnae 10–26 pairs, about 3–8 cm. long; leaflets very numerous, linear to linear-oblong, 0.8–2 (–3) mm. wide, midrib nearer one margin at base. Heads of flowers about 8 mm. in diameter, in an ample terminal panicle. Stipules at base of peduncles comparatively large and conspicuous, 5–9 mm. long, 3–4.5 mm. wide, ovate, acute at apex, subcordate at base, pubescent or puberulous. Calyx puberulous, eglandular. Pods (Fig. 15/24, p. 66) subcoriaceous, oblong, dehiscent, 5–19 cm. long, 2.5–4.2 cm. wide, glabrous except for some glands, umbonate over seeds. Seeds dark brown, smooth, elliptic, compressed, 9–11 mm. long, 6–7 mm. wide; areole 5–6 mm. long, 2.5–3 mm. wide.
