An erect annual herb. It can grow from seed each year or grow for a few years. It has many branches. It grows 10-60 cm high. The branches are hairy. The leaves have an even number of leaflets along the stalk. The leaves are 4-8 cm long. The leaflets are small. There are 16-30 pairs. They are 5-7 mm long by 2 mm wide. The flowers are yellow. They are 6 mm long. They are in clusters in the axils of leaves. The pods are narrow and compressed. They are 3-8 cm long. There are 6-12 seeds.