Vines, woody, twining, up to 5 m. Leaves pinnately 3-foliolate; stipules lanceolate, ca. 6 mm, densely villous; petiole 9-12 cm; terminal petiolule ca. 7 mm, densely white villous; leaflets subequal, both surfaces sparsely minutely villous, lateral veins 4-6 pairs; terminal leaflet suborbicular to rhomboid-ovate, 12-19.5 × 9-16 cm, base rounded to obtuse, apex acute; lateral leaflets subequal at both sides, oblique, base nearly truncate, apex shortly acuminate. Raceme axillary, up to 40 cm, shortly villous, upper part with many flowers. Flowers solitary or 2 or 3 clustered; bracteoles subtriangular, ca. 4 mm long and wide, deciduous. Calyx campanulate, exterior densely pubescent, 5-lobed; upper 2 lobes connate, middle lower lobe ca. 6 mm, laterals small; tube ca. 8 mm. Corolla purplish blue; standard broadly ovate, ca. 3 × 2.6 cm, apex emarginate, slightly reflexed, shortly clawed and with auricle at base; wings obovate, ca. 2 × 1.2 cm, apex obtuse, base acuminate, with auricles, ca. 2 mm; keels falcate, subovate, base wider, upper acuminate, near base with a triangular dentiform auricle, clawed. Stamens subequal, ca. 5 cm. Style ca. 2 cm; stigma hairy at base. Legume succulent, 12-16 × ca. 2 cm, densely shortly gray villous, apex shortly beaked, slightly jointed between seeds, dehiscent along 2 sutures. Seeds 2-10, dark brown, oblong, ca. 10 × 6 mm; hilum oblong, ca. 0.3 × 0.2 cm. Fl. Jul-Oct, fr. Aug-Nov.
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