A low shrub, scarcely taller than 0.2 m, with spreading, almost horizontal, straight, rigid branches up to longer than 0.5 m. Young branches pale yellowish brown or reddish, short-tomentose or short-villous. Leaflets subulate, short, usually 0.5-2.5 mm long, straight to S-curved, glabrous, ending in a short spinelet. Inflorescences unifloral, on the ends of lateral, leafy branchlets, with an internode of 2-4 mm below the flower bract. Flowers rather small, inconspicuous. Bract subulate, 1.6-2.4 mm, ending in a spinelet ±0.5 mm long, adaxially short-ciliate. Pedicel 1-1.5 mm long, short-tomentose. Bracteoles 1.1-1.7 mm long. Calyx tube short-tomentose (cf. A. cuspidat and A. acifera); lobes narrowly triangular, 1.1-2.1 mm long, subglabrous, spine-tipped. Petals yellow to partly brown or purple. Standard blade 5.6-6.4 x 5-6 mm, short-sericeous at least on the apical half; apex slightly incurved, subacute. Wing blades 4-4.3 x ±1.6 mm, glabrous. Keel blades strongly upcurved (at right angles), ±4.5 mm long from base to apex, 2-2.3 mm broad near the middle, obtuse, with upper margin S-curved; lower-apical third tomentulose. Pistil pubescent on upper half of the ovary and on the style base. Pod broadly triangular-lanceolate, 6.5-8 x ±2.5 mm, partly sericeous.
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Like A. acifera but calyx shortly hairy.