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Leaves pinnate with 3–5(6) pairs of leaflets; petiole (1.5)2.5–5.5(7) cm long, petiole and rachis together 2.5–10 cm long; leaflets (1.2)1.8–3.5 × 0.3–0.7(1.2) cm, narrowly oblong-elliptic to oblanceolate, cuneate to rounded at the base, emarginate, obtuse or acute at the apex, the upper surface glabrous to puberulous, the lower surface moderately appressed to spreading greyish pubescent; stipules (6)7–17 × 3–11 mm, broadly ovate, base often cordate, apex acuminate, maturing conspicuously red or brown.
Flowers in short dense pseudoracemes 1–3 cm long above a peduncle 7–17 cm long; bracts 5–15 × 4–10 mm, broadly ovate-acuminate, concave and enfolding the young buds, chestnut-brown, glabrous; pedicels 3–6 mm long in flower, elongating to 10 mm in fruit.
Calyx 10 mm long, the campanulate part 4 mm long, sparsely to moderately pubescent, the teeth longer than the tube, lanceolate at the base, attenuate above and with long spreading hairs.
Petals 11–21 mm long, pink to mauve-purple; standard broadly obovate to suborbicular, narrowing to the claw at the base.
Stems 1–many, prostrate to ascending, branching from near the base, glabrous or sparsely pubescent to ascending-pilose.
Pods only known immature, glabrous, with 10–16 seeds set transversely.
Perennial herb with a woody rootstock, up to 60 cm tall.
Staminal sheath open with the upper filament free.
Ovary glabrous; style pubescent.
