Japan Flora: Slender but firm, tufted perennial herb 20-50 cm. high; leaflets 2, lanceolate, 1.5-2 cm. long, 2-3 mm. wide, sparsely pubescent with ventrally attached hairs; bracts narrowly ovate; flowers yellow, 8-10 mm. long; legumes elEp- tic, 3-4 mm. long, puberulous, spinulose on both faces, joints flat. June-Aug. Near seashores.
Shikoku (Tosa Prov.). rare. A variable species widely distributed in die Tropics of both hemispheres.