Vines, woody, twining. Stems cylindric, pubescent. Leaves pinnately 3-foliolate, deciduous; petiole 3-8 cm, villous; stipels small, linear; petiolules 2-3 mm, densely pubescent; leaflets papery, with glands at adaxial surface; terminal leaflet ovate-rhomboid or rhomboid, 6-10 × 4-7 cm, pubescent, especially dense on veins abaxially, basal veins 3(or 5), base rounded, broadly cuneate to slightly cordate, apex acute and mucronate; lateral leaflets obliquely ovate. Raceme axillary, robust, to 20 cm; bracts large, ovate-elliptic, ca. 2 × 1 cm, membranous, deciduous. Flower 2.5-3 cm; pedicel ca. 8 mm. Calyx with bulbous-based hairs; lobes lanceolate. Corolla yellow, glabrous; standard obovate or nearly circular, with inflexed auricles on each side and with 2 inconspicuous callosities; wings oblong, shorter than standard; keels inflexed. Ovary linear, densely yellow-brown villous. Legume oblong, 3.5-5 × ca. 1 cm, densely villous, transversely constricted between seeds. Seeds 4-7, black to pitch-black, almost spherical, ca. 3 mm wide; strophiole thick and succulent. Fl. Aug-Nov, fr. Oct-Dec.
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