Vines, herbaceous, twining. Leaves pinnately 3-foliolate; stipules deciduous; petiole 1.5-6 cm; terminal petiolule 5-12 mm, densely white villous; leaflets subequal, both surfaces villous, lateral veins 3 or 4 pairs; terminal leaflet narrowly ovate or triangular-ovate, 4-16 × 2-6 cm, base obtuse, apex acuminate; lateral leaflets subequal at both sides, oblique, base almost truncate, apex acuminate. Raceme axillary, 2-7 cm, upper part with many flowers. Calyx broadly campanulate, exterior densely pubescent, 5-lobed; upper 2 lobes connate, middle lower lobe ca. 4 mm, laterals small; tube ca. 4 mm. Standard broadly ovate, ca. 1.4 × 1.6 cm, apex emarginate, slightly reflexed, shortly clawed and with auricle at base; wings obovate, ca. 2 × 1.2 cm, apex obtuse, emarginate, base clawed, with auricles, ca. 1 mm; keels falcate, base wider, upper acute, near base with a triangular dentiform auricle, clawed. Stamens subequal, ca. 1.8 cm. Style ca. 1 cm. Legume 7-13 × 0.6-0.8 cm, leathery, densely brown villous, apex beaked, dehiscent along 2 sutures. Seeds 5-12, black, oblong, 5-6 × 3-4 mm; hilum oblong. Fl. Sep-Oct, fr. Oct-Nov.
Open forests; at elevations from near sea level to 700 metres. Hedges, bamboo forest and deforested areas, on clay soils; at low elevation up to 1,000 metres.
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