Annual or biennial, 2–3 ft. high, copiously branched, the branches firm, slender, thinly silky. Stipules minute, setaceous. Petioles 1/2– 3/4 in. long. Leaves with usually two lateral pairs of leaflets and a terminal one, which are elliptical, 3/4–1 1/4 in. long, the apex rounded and mucronate, bright green, the lateral ones opposite, nearly sessile, both sides subglabrous. Flowers in lax racemes of about 20 flowers each on erecto-patent peduncles 1–2 in. long from the axils of the leaves. Calyx a line deep, thinly silky, the teeth setaceous, reaching down nearly to the base. Corolla lilac, three times as long as the calyx. Pod linear, mucronate, deflexed, subtetragonous, subglabrous, 1–2 in. long, 1 line broad, 8–10-seeded.
