Psoralea pinnata is an erect shrub or small tree, which grows up to 4 m high, with blue, lilac and white, pea-shaped flowers. The leaves are compound and are composed of several pairs of leaflets and a terminal one. The leaflets are 50 mm long and 3 mm wide and are aromatic when crushed. The pea-flowers are borne at the ends of the branches or in the axils of the upper leaves.
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