Description from Flora of China
Perennial herbs, ca. 50 cm tall. Stems erect, ridged, spreading villous when young, glabrescent, branched, branchlets ascending. Stipules on main stem linear-ovate, longer than petiole, on branches lanceolate, shorter than petiole; leaflets obovate or narrowly obovate, 2-4.5 × 0.8-2 cm, sparsely villous abaxially, glabrous adaxially, base cuneate, apex rounded, mucronate. Racemes 10-30 cm; flowers alternate; bracts ovate, 1.2-1.9 cm. Calyx 8-13 mm, sparsely puberulent. Corolla yellow, 2.4-2.8 cm, petals long clawed. Ovary densely silky; ovules 16-22. Legume linear-lanceolate, 5-7 × 0.7-0.8 cm, held almost erect and close to stem, thinly woody, beaked, sparsely appressed yellowish hirsute. Seeds 15-20, reddish brown, reniform, ca. 2.5 × 2 mm, densely glandular. Fl. Apr-May, fr. Jun-Jul.
Stream banks, wastelands, roadsides. Anhui, Fujian, Hebei, Hubei, Jiangsu, Shaanxi, Zhejiang [Japan].