Erect shrublet up to 70cm. Leaves 3-foliolate, leaflets subterete or slightly angular, glabrous; flowers single on short shoots, scattered along branches, bright lemon- or sulphur-yellow, wings glabrous, keel with tip nearly pointed, glabrous, calyx compressed, glabrous, fleshy, lobes large and broad below, cordate-triangular, basally rounded.