Shrubs, 2-3(-4) m tall, often scandent. Stems dark brown, terete, with obvious lenticels; young branches light brown, angular, with appressed brown medifixed symmetrically 2-branched trichomes, glabrescent. Stipules lanceolate, 2-3 mm, caducous. Leaves 10-20 cm, (11 or)13-23(-27)-foliolate; petiole and rachis with appressed medifixed trichomes; petiole 1-5(-6) cm; rachis adaxially grooved; stipels subulate, 0.5-1 mm, persistent; petiolules 1.5-2 mm, hairy; leaflet blades opposite, elliptic to oblong but terminal one obovate, 1-2.5(-3.5) × 0.5-1.5 cm, papery, abaxially with sparse appressed white medifixed trichomes, adaxially glabrous, midvein adaxially impressed, secondary veins 6 on each side of midvein and obvious, base cuneate, broadly cuneate, or rounded, apex obtuse to emarginate. Racemes 30-35 cm, drooping; peduncle 1-2 cm, with appressed medifixed trichomes; bracts lanceolate, ca. 3 mm. Pedicel 2-3 mm. Calyx cup-shaped, 2.5-3 mm, outside with appressed medifixed trichomes; tube ca. 1.5 mm; teeth ovate to lanceolate, mostly shorter than tube. Corolla pink; standard oblong, 9-11 × ca. 5 mm, bluish pink, outside densely white strigillose-puberulent, base shortly clawed; wings ca. 1 cm, base auriculate and shortly clawed, margin ciliate; keel as long as wings, outside apically hairy, margin ciliate, spurs ca. 1.5 mm. Stamens 8-9.5 mm; anthers broadly ovoid, base with a few trichomes. Ovary glabrous, with 9-12 ovules. Legume brown, cylindric, ca. 5 cm × 3-4 mm, with sparse appressed medifixed trichomes; endocarp blotched. Seeds 8-10 per legume, reddish brown, ellipsoid, ca. 3 × 2 mm. Fl. Jun-Aug, fr. Sep-Oct.
Can be grown by cuttings or seedlings. Seeds needs soaking.
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