Herbs. Stems twining, slender, sparsely pubescent. Leaves pinnately 3-foliolate; stipules small, linear-lanceolate, ca. 3 mm, deciduous; petiole 1.1-4 cm, sparsely pubescent; petiolules ca. 1 mm, pubescent; leaflets thinly papery; terminal leaflet broadly triangular or broadly ovate, 1.8-4.5 × 1.8-4.5 cm, both surfaces pubescent, sometimes with orange sessile glands, denser abaxially, basal veins 3, lateral veins 2 or 3 pairs, base almost truncate or sometimes broadly cuneate, apex acute or acuminate; lateral leaflets smaller, broadly ovate, usually oblique. Raceme axillary, 1.5-6 cm, sparsely pubescent, 2-to several flowered. Flower 1.5-1.7 cm; pedicel ca. 2 mm, pubescent; bracteoles small, linear-lanceolate. Calyx ca. 8 mm, densely pubescent, with red glands; lobes linear-lanceolate, unequal, shorter than or subequal to tube. Corolla yellow; standard almost orbicular, longer than wide, base with 2 auricles; wings obovate, inflexed, base with curved auricles; keels slightly inflexed, semicircular. Ovary stipitate, pubescent, with glands; ovules 7-10; style slender, upper glabrous, apex slightly inflated. Legume linear-oblong, 3-6 × 0.5-0.8 mm, compressed, sparsely pubescent, acute at both sides, apex beaked, stipe 0.6-1 cm. Seeds 5-8, reddish brown, almost orbicular, 3-4.5 mm in diam. Fl. Feb-Nov, fr. Jun-Dec.
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