Erect or ascending shrub, 0.2-0.6 m tall, with rigid branches; young branches white-tomentose or woolly. Short-shoots soon developed in axils of long-shoot leaves. Leaflets lanceolate, (4-)7-13 x (0.5-)1.2-2 5 mm, flat, more or less keeled, rigid, sparsely ciliate but otherwise subglabrous, veiny, each tapering into a long, sharp spine. Inflorescence a head of 4-14 flowers. Bract narrowly lanceolate, 8-15 x 1-2 mm, spine-tipped. Pedicel ±1 mm long or less, pubescent. Bracteoles similar to the bract, 7-11 mm long. Calyx with sparse spreading hairs; the lobes linear-subulate, 7-9 mm long, tapering into a long, sharp spine. Petals yellow to ± reddish. Standard blade elliptic or ovate, 7.5-8.5 x 5-7 mm, retuse, pubescent on apical two-thirds of back. Wing blades oblong, 6.5-7.5 x 2.5-3 mm, subglabrous (few hairs on lower apical half). Keel blades 6-6.5 x 2.5-3 mm, pubescent on apical half. Pistil and basal half of style pubescent only along the upper edge, otherwise glabrous; ovules 6 or 7. Pod obliquely and narrowly ovate, ±10 x 4.5 mm, glabrous except along upper suture, smooth.
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Like A. acidota but flowers smaller, standard < 7 mm, and ovary and fruit hairy only along dorsal suture.
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