Although it is a vine perennial herb the base becomes woody. The vine reaches more than 5 m in length. The stems are sparsely crushed with short downward pressures but many later fall off. The leaves are three-leaved compound leaves the leaflets are slightly yellowish green round to wide oval 5 to 12 cm long 4 to 10 cm wide slightly leathery with sharp or rounded tips. The leaves are oval and have sharp tips and fall off quickly. The flowering period is in summer and a general inflorescence is produced from the leaves. Add more than a dozen flowers to one inflorescence. The flowers are light pink and 2.5 to 3 cm long. The wing and keel flaps are almost the same length. The heel is about 1 cm in length and the tip of the upper heel piece protrudes slightly. Note that this flower is upside down from a normal bean flower that is the keel flap is up the tip is down and the flag valve is down. This is because the branches of the inflorescences coming out of the leaf buds are curved downward and extend. The legumes are 5 to 10 cm long and 3 to 3.5 cm wide and contain 2-5 seeds. The seeds are brown ellipsoid 1.5 cm long and have a navel.