Herbs perennial, 50-150(-200) cm tall. Stem erect or climbing, green or yellow with black-brown spots, puberulent when young, later glabrescent. Leaves paripinnate, 2-17 cm; stipules hastate, 8-15 mm, margin toothed; leaflets 2-5-paired, elliptic or lanceolate, often narrowly so, 20-60(-100) × 10-35 mm, membranous, abaxially pilose or glabrescent, adaxially glabrous, apex obtuse or acuminate, mucronate; lateral veins obvious; tendril well-developed, 2-or 3-branched. Raceme unbranched, longer than leaf, 5-18 cm, rarely branched and very short, 15-30-flowered. Calyx obliquely campanulate, shortly toothed. Corolla blue-purple, purple, pink, pale yellow, or white, 10-15 mm; standard subequaling wings and keel. Ovary glabrous; ovules 2-6. Legume brown-yellow, oblong, flat, 20-35 × 6-8 mm. Seeds 2-6. Fl. Jun-Sep, fr. Jul-Oct. 2n = 12, 14.
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A climber. It grows 50-200 cm high. The leaves have leaflets along the stalk. There is a tendril at the end. There are 4-10 leaflets and they are 3-6 cm long by 1-3 cm wide. The flowers are purple. There are several flowers in groups in the axils of leaves. The pod is flat and 3 cm long. There are 1 or 2 seeds.
Shrubberies, dry slopes and forest edges. Hill slopes, bush-woods and forests; at elevations from 800-2,000 metres in northern and western China.
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It is a temperate plant. It grows in forests, pastures and on limestone areas between 400-3,000 m above sea level. In Sichuan and Yunnan.
Can be grown by seedlings. Seeds needs soaking.
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