Low, wide-spreading, diffusely branched shrublet, 0.15-0.3 m tall, branches pale yellow or orange when young. Leaves sparsely set, 3-foliolate, leaflets slightly recurved, sharply spine-tipped, spreading. Flowers 2 or 3, terminally closely set, light yellow, calyx tube with sparse, appressed hairs, lobes, tapering into sharp spinelets, glabrous, standard short-silky on upper part of back, keel upcurved at ± right angles, short-silky along lower margin. Pods triangular-lanceolate.
Like A. acifera but keel shortly hairy on lower margin only and wing blades longer than 4 mm.