A small or moderate-sized tree, wholly glabrous. Extremities brown, smooth, with short black and shining hooked infra-stipular prickles, or wholly unarmed. Leaves glaucous, scarcely exceeding 2–3 in. in length; pinnæ lax in 2–3 pairs; leaflets oblanceolate- or obovate-oblong oblique, obtuse, often mucronulate, subsessile, in 3–5 pairs; 1/4– 1/3 in. long, 1 1/2–2 lines broad above. Spikes axillary, solitary or fascicled, equalling or exceeding the leaves. Flowers subsessile. Calyx broadly and shortly toothed. Petals at least at first united about 2/3 their length. Ovary glabrous, shortly stipitate. Legume flat, oblong, often once or twice constricted owing to abortion of seeds, obtuse or pointed; valves thinly coriaceous, transversely reticulate, glabrous, shortly stipitate, 2–3 in. long, 3/4–1 in. broad.