Erect shrublet, 15-40 cm. Leaves 3-foliolate, leaflets linear-lanceolate, flat, weak, veiny or almost smooth, glabrous or thinly hairy. Flowers in a terminal head, bright yellow, often partly reddish on standard, wings and keel hairy, calyx silky, lobes awl-shaped, weak, tapering, sometimes with distinct midvein.