Arborescent, wholly glabrous; young shoots, peduncles, and leaves more or less glaucous. Infra-stipular spines geminate, very acute, short or sharply recurved, brownish-black. Leaves 1 1/2–2 1/2 in. long; rachis slender, with 1 (or 2) slightly elevated gland; pinnæ 3-jugate; leaflets 1-jugate, broadly and very obliquely obovate-rotundate, entire or retuse, reticulate, drying blackish paler beneath, 1/3– 1/2 in. long, 3–5 lines broad. Spikes axillary, solitary in our specimen, a little exceeding the leaves; flowers rather lax at least below, sessile or subsessile. Calyx deeply rather acutely toothed. Petals free, twice as long as the calyx. Ovary glabrous, on a stipes of its own length. Legume not seen.