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subglabrous, the reddish-brown twigs, petioles, and peduncles minutely puberulous; prickles in pairs below the nodes, recurved, or none; pinnæ 8–14-pair, the unarmed petiole with a gland; leaflets 15–30-jugate, narrow-linear, glabrous or nearly so; calyx rather shorter than the corolla; legume linear, flat, bivalve. Spines small and often absent. Leaves 4–6 inches long, the pinnæ 2 1/2 inches long; pinnules 4 lines long, 1/2 line wide, paler beneath. Spikes often 3–4 inches long. Legume 3–3 1/2 inches long, 3–4 lines wide, 6–8-seeded, often irregularly sinuous at the margin.