Shrub or small tree, 1.0-4.5 m high; trunk up to 200 mm diam. Branches strong, short-tomentose when young. Leaflets 7-16 mm long, rigid, straight, glabrous, tapering into sharp spinelet > 1 mm long. Inflorescences unifloral; flowers scattered on branches, 2-4 on branchlet tips. Flowers yellow, fading brown. Calyx: tube short, widely campanulate, shortly hairy; lobes needle-like. Flowering time Oct.-June. Pod obliquely lanceolate, turgid.
Erect shrub or small tree, 1-5 m. Leaves 3-foliolate, leaflets terete, needle-like, straight, rigid, spine-tipped, glabrous. Flowers single, scattered, yellow, fading brown, wings hairy, keel with slightly S-curved upper margin, shortly hairy, calyx shortly hairy, lobes needle-like, rigid, spine-tipped, glabrous.