A small or medium-sized tree; extremities glabrous, with a brownish or ashen bark. Stipular spines occasionally very short, usually prominent, patent, straight, 1/2–2 in. long, flattened below on the upper face. Leaves puberulous or glabrescent; rachis 1 1/2–4 in., with a small gland near the base; pinnæ in 7–13 pairs; leaflets linear-oblanceolate or linear, rather obtuse, in 12–26 pairs, 1 1/2–2 lines long. Spikes axillary solitary or 2–3 together, 2–4 in. long. Flowers sessile. Petals free at the apex, about 4 times as long as the short deltoid-toothed calyx. Legume broadly oblong, obtuse, minutely apiculate, abruptly narrowed at base into a stipes of 1/4– 1/2 in., flat, valves coriaceous, brown, shining, much reticulate, 2–2 1/2 in. long, 3/4–1 1/6 in. broad.