Erect shrub or shrublet to 1.5 m, branches often standing in one or several horizontal planes. Leaves 3-foliolate, leaflets terete, glabrous or thinly hairy. Flowers 1(2) on short shoots, scattered, bright yellow, rarely purple on standard, wings and keel glabrous, calyx hairy, often reddish, lobes with thickened margins, hairy.