Trees, 5-23 m tall, 20-80 cm d.b.h.; bark green-gray or gray-brown, smooth; young branches and buds hairy, old branches purple-brown, glabrous. Leaves 12-20 cm; leaflets 9-13, opposite distally, sometimes subopposite proximally, ovate, ovate-elliptic, or elliptic, 2-8 × 1.5-2.8 cm, pubescent, base cuneate or rounded, apex obtuse or acute. Racemes 3.5-8 cm; rachis densely brown hairy. Flowers 8-10 mm; pedicel 2-4 mm, slender, densely hairy. Calyx 1.6-3.3 mm, campanulate; teeth to 1.6 mm, densely yellow-brown hairy. Corolla white; standard ovate or obovate, 4-6 mm, claw to 2 mm. Ovary densely villous, linear-oblong. Legumes brown, narrowly ovate to elliptic, flat, 4.5-8.5 × 1.6-2.5 cm; wing 2-6 mm; stalk 5-7 mm. Seeds 2 or 3, yellow-brown, lustrous, elliptic. Fl. Jun-Jul, fr. Aug-Sep.
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