A spreading, low shrublet, 0.15-0.4 m high, with straight rigid branches usually ending in very sharp branch thorns, rarely with weaker branches with (distally small) leaves. Leaflets 2-7(-9) mm long, straight or apically slightly recurved, acute or apiculate. Calyx often partly purple, dorsal with ± prominent double ridge (separated by a deep groove); lobes (1.5-)2-4(-5) mm long, with broad marginally green and thickened base, the upper often ± overlapping. Petals bright yellow or often partly red or purplish on standard.
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