Description from Flora of China
Vicioides sepium (Linnaeus) Moench.
Herbs perennial, 30-100 cm tall. Stem erect or climbing, slender, pilose. Leaves paripinnate, 7-12 cm; stipules semihastate, margin 2-4-toothed; leaflets 5-7-paired, oblong-ovate or oblong-lanceolate, 6-30 × 4-13 mm, pilose, apex obtuse or truncate, mucronate; tendril branched. Flowers 2-4(-6) in axillary fascicles. Calyx campanulate. Corolla pale violet-purple, red, or nearly purple to pink, 10-15 mm; standard nearly violin-shaped; wings shorter than standard; keel curved inward. Ovary shortly stalked, linear, glabrous; ovules ca. 5. Legume broadly oblong to subrhomboid, slightly curved, 20-40 × 5-7 mm, apex beaked. Seeds 5-7, oblate-spheroid. Fl. Mar-Jun, fr. Mar-Aug. 2n = 12, 14.
Forest margins, hedges, hillocks, hill slopes, grasslands, fields, roadsides; 1000-2200 m. Gansu, Guizhou, Shaanxi, Sichuan, Xinjiang, Yunnan [Japan, Kashmir, Kazakhstan, Korea, Kyrgyzstan, Mongolia, Russia, Tajikistan; SW Asia (Caucasus, E Turkey), Europe; introduced and naturalized in temperate regions elsewhere].