Herbs perennial, (15-)40-100(-180) cm tall. Stem subshrubby, pilose when young. Leaves paripinnate; stipules hastate or sublanceolate, 8-20 × 3-5 mm, margin unequally toothed; leaflets 1-paired, ovate to lanceolate or rhombic-elliptic, (15-)30-90(-115) × (6-)15-40(-50) mm, both surfaces pilose, apex sometimes acuminate; tendril rarely present, usually replaced by a mucro. Raceme rarely branched, ± cylindric, 4.5-7 cm, usually obviously longer than leaf, densely 8-20-flowered. Calyx campanulate or obliquely so, glabrescent. Corolla deep or light blue to purple to red, rarely white; standard violin-shaped, constricted at middle, 11-15 mm; wings 13-14 mm, longer than keel. Ovary linear, glabrous; ovules 2-8. Legume oblong, flat, 20-35 × 5-7 mm, glabrous, apex beaked. Seeds 3-7, oblate-spheroid. Fl. Feb (in S Yunnan), Jun-Sep, fr. Jul-Oct. 2n = 12, 14, 24.
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