Robust climbers, with tuberous roots. Stems to 8 m, woody at base, hirsute with yellowish hairs in all parts. Stipules dorsifixed, ovate-oblong, striate; stipels linear-lanceolate, equal to petiolules or longer; leaflets 3-lobed, rarely entire, terminal one broadly ovate, 7-15(-19) × 5-12(-18) cm, apex acuminate, lateral ones obliquely ovate, smaller, with yellowish adpressed hairs adaxially, more densely hairy abaxially. Racemes 15-30 cm. Flowers 2 or 3 aggregated at nodes. Bracts linear-lanceolate to linear, shorter or longer than bracteoles, caducous; bracteoles ovate, less than 2 mm. Calyx 7-20 mm, villous with yellow-brown hairs; lobes lanceolate, acuminate, slightly longer than tube. Corolla purple; standard obovate, 8-18 mm, auriculate and with yellow callosities at base, shortly clawed; wings falcate, narrower than keel, base with linear auricles; keel falcate-oblong, with very small and acute auricles. Vexillary stamen free in upper part. Ovary linear, hairy. Legumes long elliptic, 4-14 cm × 6-13 mm, flattened, brown hirsute. Fl. Jul-Oct, fr. Oct-Dec.
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A robust climbing bean. It has tuberous roots. The stems are 8 m long and woody at the base. There are yellow hairs. The leaves have leaflets and these have 3 lobes. The end leaflet is broadly oval and 7-15 cm long by 5-12 cm wide. The side leaflets are smaller and are oblique. The flowering stalks are 15-30 cm long with flowers in groups of 2 or 3 at each node. The flowers are purple. The pods are 4-14 cm long by 6-13 mm wide and flattened.
Thickets and thin woods all over Japan. Thickets, forests, on dry slopes or in moist places, in sandy or loamy soils, valleys, roadsides, open pastures, hedges, river sides, swamps; at elevations up to 1,500 metres..
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Thickets and thin woods all over Japan. Thickets, forests, on dry slopes or in moist places, in sandy or loamy soils, valleys, roadsides, open pastures, hedges, river sides, swamps; at elevations up to 1,500 metres..
It is a tropical plant. It grows in mountain forests and open places.
Can be grown by seedlings. Seeds needs soaking.
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