Shrubs, to 2.5 m tall. Branches terete, glabrescent; young shoots 4-6-sided. Leaves 3-foliolate; petiole 1.5-7 cm; terminal leaflet blade rhombic to broadly obovate, 5-15(-17) × (3-)4-13 cm, lateral leaflets 3.5-13 × 2-8 cm, densely appressed tomentose on both surfaces, becoming glabrescent adaxially, lateral veins 9-15 on each side of midvein and reaching margin. Umbels often 10-20-flowered. Pedicel 2-3 mm at anthesis, afterward 3-7 mm. Calyx 5.5-6.5 mm, 4-lobed; upper lobes entire or minutely 2-toothed at apex. Corolla white; standard broadly obovate or broadly elliptic, 9-12.5 × 7.5-10.5 mm, shortly clawed; wings narrowly elliptic, 9.5-12.5 × 3-4.5 mm, base auriculate on both sides, claw 2.5-3 mm; keel 9.5-11.5 × 3.5-4.5 mm, claw 2.5-3 mm. Stamens 10-11 mm. Pistil 11-13.5 mm; ovary densely puberulent; style 9-11.5 mm, puberulent in lower half. Legume narrowly oblong, 13-27 × 4-5.5 mm, 2-5-jointed, densely appressed sericeous, both sutures undulate; articles broadly elliptic or nearly orbicular, 5-8 × 3-5 mm. Seeds transversely elliptic, 2.5-2.7 × 3.7-4 mm.
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