Slender, erect shrub, 1-3 m. Leaves 3-foliolate, leaflets subterete, weak, ± curved, glabrous or subglabrous. Flowers 2-12 in a terminal raceme, bright yellow, rather large, wings glabrous, keel rostrate, glabrous or thinly adpressed-hairy, calyx glabrous, lobes triangular, glabrous.