stout vines, up to 8 meters long, all covered with yellow bristles, woody stems and thick blocky roots. Pinnate compound leaves with 3 leaflets; Stipules dorsifixed, ovate-oblong, with lines; Stipules linear-lanceolate, equal to or longer than petioles; Leaflets trifoliate, occasionally entire, terminal leaflets are broadly ovoid or obliquely ovoid, 8-15(-19) cm long and 5-12(-18) cm wide, the apex is long and tapering, lateral leaflets are obliquely ovoid, slightly smaller, and are covered with pale yellow and prostrate vegetables. The bottom is dense; Petiole is yellow-colored fluff.
The raceme is 15-3cm long, with dense flowers above the middle; Bracts linear-lanceolate to linear, much longer than bracteoles, caducous; Bracteoles ovate, less than 2 mm long; 2-3 flowers are clustered on the nodes of inflorescence axis; Calyx bell-shaped, 8-1 mm long, yellow-brown pilose, lobes lanceolate, acuminate, slightly longer than calyx tube; Corolla is 1-12 mm long, purple, flag petal obovate, with 2 ears and a yellow hard scabby appendage at the base, with a short stalk, wing petal sickle, narrower than keel petal, linear and downward ear at the base, keel petal sickle oblong, and extremely small and acute ear at the base; Only the upper part of one stamen opposite to the flag petal is free; Ovary linear, hairy.
pods are oval, 5-9 cm long and 8-11 mm wide, flat and covered with brown bristles. The flowering period is from September to October, and the fruiting period is from November to December.