Vines, herbaceous or sometimes almost woody, ca. 50 cm. Stems slightly robust, densely villous or tomentose, with dark brown sessile glands. Leaves pinnately 3-foliolate; stipules lanceolate, 4-8 mm, usually persistent; petiole 2.5-6 cm; stipels absent; petiolules 1-3 mm, hairy; leaflets papery; terminal leaflet reniform or oblate, 2-3.7 × 2.5-5.3 cm, densely gray villous, with dark brown glands, basal veins 3, lateral veins 2-4 pairs, reticulate veins visible, base shallowly cordate to almost truncate, margin slightly sinuate, slightly reflexed when dried, apex rounded or almost truncate, usually with small mucro; lateral leaflets smaller, slightly oblique. Raceme axillary, rarely solitary or branched, 2-5 cm; peduncle 1-3.5 cm, densely hairy; bracts lanceolate, 4-7 mm, persistent. Flowers yellow, 1.4-2 cm; pedicel 2-8 mm. Calyx 5-lobed; lobes lanceolate, longer than tube, lower one longest. Standard subcircular or obovate-circular, 1-1.5 cm, glabrous, base with 2 auricles; wings elliptic to obovate-elliptic, 7-13 mm, auriculate on one side; keel very wide, subobovate, 7-14 mm, without auricle. Ovary densely silky hairy, sessile; ovules 1 or 2; style linear, lower part silky hairy. Legume reddish brown, obovate-orbicular to ellipsoid, 2-2.5 × 0.7-0.8 cm, sparsely pubescent, apex beaked. Seeds dark brown, reniform or orbicular, 4-5 × 5-6 mm. Fl. May-Aug, fr. Jun-Oct.
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