scandent; prickles scattered, very small, numerous; twigs, petioles, and peduncles minutely downy or glabrate; petioles armed; pinnæ 3–5-jugate, with convex glands; leaflets 6–12-pair, obliquely oblong, obtuse, mucronulate, glabrous, shining above; heads globose, the peduncles racemoso-paniculate; ovary stipitate, pubescent; legume broadly-linear, membranous, flat, glabrous, straight, several-seeded, stipitate. A slender shrub, with flexuous or twining branches. Petioles mostly aculeate. Leaflets 4–5 lines long, 2 lines wide, paler beneath. Inflorescence disposed in terminal panicles. Legumes 3–4 inches long, the margin slightly sinuous. Prickles much smaller and leaflets larger than in A. pennata.