Much-branched, rigid shrub, 0.6-2.5 m. Leaves 3-foliolate, leaflets terete or subterete, sausage-shaped, straight or slightly incurved, often slightly prickly. Flowers 2-7 in terminal heads, sometimes scattered, rarely solitary on short shoots, bright yellow, standard partly red, wings and keel glabrous, calyx fleshy, sparsely hairy or glabrous, lobes ± orbicular; bract attached to pedicel.