An erect or ascending shrublet, 0.2-0.4(-0.8) m tall, rather branched; branches rigid, the young ones densely short-tomentose. Short-shoots soon developed in axils of long-shoot leaves. Leaflets oblanceolate, 4-10 x 1-1.5 mm, stiff, leathery, apically spine-tipped, glabrous, ± veiny. Inflorescence a terminal head of 3-9 subsessile flowers. Bract ovate-lanceolate(-linear), 4-9 x 0.5-3 mm, stiff, apically spine-tipped, rigid, veiny, often ± recurved, glabrous except for marginal ciliation. Pedicel shorter than 1 mm, tomentose. Bracteoles subulate, 3-8 mm long, spine-tipped. Calyx tube densely tomentose; lowest lobe 5-6(-7) mm long, ± oblanceolate, ± veiny, partly glabrous, green, mucronate, other lobes 3-5 mm long, triangular-subulate, spine-tipped. Petals bright yellow. Standard blade ovate, 6.5-8.5 x 6.5-8.5 mm, obtuse, short-sericeous on the back. Wing blades oblong, 5-6.5 x 3-3.5 mm, glabrous. Keel blades 5.5-6.5 x 3-3.5 mm, glabrous. Pistil pubescent on upper side of ovary and style base; ovules (2-)4. Pod narrowly and obliquely ovate, 5-6 x 2.5-3 mm, smooth, dark when ripe.
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Erect shrublet to 80 cm. Leaves 3-foliolate, leaflets oblanceolate, stiff, leathery, spine-tipped, ± veiny, glabrous. Flowers in a terminal head, bright yellow, wings and keel glabrous, calyx hairy, lobes triangular to awl-shaped, spine-tipped, the lowest lobe oblanceolate, ± veiny.