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Edible Portion: Tubers, Roots, Seeds

A bean plant. It is a twining herb. It keeps growing from year to year from root tubers. The leaves are compound with 3 leaflets. The leaf stalks are 2-3 cm long. The leaflets are 4 sided and 2-6 cm long by 2-5 cm wide. The flowering shoots are in the axils of leaves and there are 1-4 flowers in a group. The fruit is a pod 6 cm long by 8 mm wide. It is slightly curved. There are 6-7 seeds.