Shrubs or small trees, ca. 3 m. Bark of stems smooth. Branchlets inconspicuously grayish pubescent. Leaves imparipinnate, 21-31 cm; petiole 3.3-9 cm; rachis 5.5-13 cm, prolonged 6-10 mm below terminal leaflet; petiole and rachis short gray pubescent; leaflets 11-13 pairs; petiolule 2-5 mm, corrugated, grooved, sparsely gray pubescent; blades pale abaxially, dark green adaxially, ovate-elliptic or oblong-lanceolate, 6-12 × (1.5-)2-2.5 cm, widest below middle, leathery, sparsely short gray pubescent abaxially, glabrous adaxially, base broadly cuneate to rounded, apex obtuse, slightly apiculate; midvein raised abaxially and impressed adaxially, lateral veins 5-8 pairs, arcuate, both lateral veins and veinlets slightly raised, inconspicuous. Panicles terminal, 12-20 cm, appressed gray pubescent; pedicel 5-6 mm, densely appressed short gray pubescent. Calyx teeth oblong-ovate, slightly longer than calyx tube, 3-5 mm, abaxially appressed pubescent, adaxially gray pubescent inside. Corolla purple; standard broadly ovate, ca. 1.5 cm wide, widest at base, truncate-rounded, claw ca. 2 mm; wings 2-auriculate at base; keel marginally puberulent. Stamens unequal; filaments 0.8-1.5 cm, free. Ovary sessile, ovate or oblong, glabrous; ovules 6. Legumes ellipsoid or oblong, 3.5-7.2 × 2-2.3 cm, stipe 2-3 mm; valves black and glabrous, thinly leathery, internally septate, tissue loose, velvety, spongy. Seeds 2-6, red, ellipsoid, ca. 1.1 × 0.7 × 0.6 cm; hilum elliptic, ca. 3 mm. Fl. Jun, fr. Sep.
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