Trees, to 16 m tall; bark gray or gray-brown, smooth, lenticellate. Leaves imparipinnately compound; leaflets 8-11, alternate; stipels absent; petiolule 4-5 mm, white hairy when young, then glabrous; blades ovate or oblong-ovate, terminal one larger, usually 3.5-14.3 × 1.8-6.5 cm, papery, golden pilose along main vein abaxially, dark green and glabrous adaxially, veins raised on both surfaces, base broadly cuneate, apex acute. Panicle terminal or axillary, 10-28 cm; bracts caducous. Calyx campanulate, 7.2-8 mm, triangular toothed, yellow-brown tomentose. Corolla white; standard elliptic or ovate-elliptic, 9.3-15.2 × 9-13 mm, rounded or retuse at apex, claw 2.3-5.1 mm; wings sagittate, 9.3-14.4 mm, auriculate at base, obtuse at apex; keels falcate, 8.8-14.9 × 4.8-7.2 mm, auriculate at base. Ovary sessile, densely yellow-white sericeous; ovules (1-)3-5; style slightly curved, glabrous. Legumes oblong, flat, 4.5-8 × 0.8-1 cm, beaked at apex, wingless. Seeds 1-5, gray-brown, reniform. Fl. May-Jul, fr. Aug-Sep.
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