Trees, to 20 m tall. Young branches gray-brown hairy. Leaves imparipinnate, to 20 cm; leaflets 9-13, alternate; stipels absent; petiolule 1-3 mm; blades ovate-lanceolate or oblong-lanceolate, 3.9-11.3 × 1.7-3.8 cm, gray-white hairy abaxially, dark green and glabrous adaxially, veins obviously raised abaxially with obvious veinlets, base obtuse or slightly cordate, apex acuminate or obtuse. Panicle terminal, 12-30 cm; bracts caducous. Calyx campanulate, 4.6-6.9 mm, with 5 semiorbicular teeth, densely whitish rusty brown pubescent. Corolla white or light yellow, rarely pink; standard obovate or orbicular, 6.4-14.4 mm, retuse at apex, narrowing to claw at base, claw 0.6-3.2 mm; wings sagittate, 6.4-9.6 mm, claw 2.1-4 mm; keels lanceolate, 6.2-10.5 mm, auriculate at base. Ovary linear, light yellow pilose, 6-10-ovuled. Legumes flat, elliptic or long elliptic, wingless, 3-8 × 1-2 cm, with 1-3(-5) seeds. Seeds brown, ovoid, compressed, ca. 4 × 2 mm. Fl. Jun-Aug, fr. Aug-Oct.
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