Spreading shrublet, 50-80 cm. Leaves 3-foliolate, leaflets subterete, slightly flattened, densely white-woolly. Flowers single on tips of branchlets, partly surrounded by upper leaves, pale yellow, fading purplish, wings glabrous, keel purplish, with slightly S-shaped, upper margin, glabrous, calyx densely white-woolly, lobes linear, slender, weak, long-hairy.