Tree of 15–20 ft., covered with a grey tomentose-pubescence. Stipular spines very short, conical, glabrous and shining at the apex or stout terete and elongate. Leaves 2–3 in. long, villose-pubescent, rachis with a concave sessile gland near the base as well as between the upper or all of the pinnæ; pinnæ in 6–11 pairs, leaflets in 10–18 pairs, linear, subacute, 2–2 1/2 lines long. Peduncles axillary, 1/4–1 in. long, involucel below the middle or near the base. Flowers capitate. Petals united 3/4– 4/5 their length, 2–3 times longer than the obtusely 5-toothed pubescent calyx. Legume straight or but slightly curved, compressed, linear, broadly pointed or obtuse, much narrowed at base, 4–6 in. long, scarcely 1/2 in. broad, in our scarcely ripe specimens; margins continuous or sinuous from abortion, valves pubescent-tomentose obscurely longitudinally nerved.
