Herbs. Stems twining, slender, pubescent. Leaves pinnately 3-foliolate; stipules lanceolate, 1.5-3 mm, pubescent; petiole slender, 0.5-2 cm, sparsely pubescent; stipels extremely small or inconspicuous; petiolules short, ca. 1 mm, pubescent; leaflets papery; terminal leaflet elliptic, ovate-elliptic, or oblong, 1.6-2.6 × 0.5-0.7 cm, both surfaces densely pubescent, abaxial surface with light brown sessile glands, basal veins 3, slender, base rounded, apex obtuse or almost round; lateral leaflets obliquely elliptic, 1-2.1 × 0.5-0.8 cm. Inflorescence 1-flowered; pedicel ca. 4 mm. Calyx campanulate, pubescent; lobes lanceolate, lowest longest, ca. 5 mm, longer than tube. Corolla yellow, 0.9-1.1 cm; standard suborbicular, base with lobed auricles on both sides, apex slightly emarginate; wings oblong, base with acute auricles; keels slightly shorter than wings, almost round. Ovary sessile, pubescent, with light brown glands; style slender; stigma small. Legume oblong, 3.5-4 × ca. 0.7 cm, slightly curved, compressed, pubescent, apex beaked; stipe absent. Fl. Jun-Aug, fr. Mar-Nov.
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