An erect or ascending, branched shrub, 0.8-2 m tall, with densely short-tomentose or sericeous branch ends. Leaves on inconspicuous, semi-globose leaf base tubercles. Leaflets piniform, (15-)20-35 mm long, slender, slightly incurved, yet somewhat rigid, silvery sericeous(-tomentose), except on the spine-tipped or mucronate apex. Inflorescence with 1-3(4) flowers together on lateral short-shoots, these distributed along the branches, often in fairly great number. Flowers rather small. Bract caducous, subulate or filiform, weak, 1.3-1.8 mm long, sericeous. Pedicel 1.5-2.5 mm long, sericeous. Bracteoles 1-1.6 mm long. Calyx tube cylindrical-campanulate, partly dark or purplish, sericeous; lobes narrowly triangular, 0.8-1.3 mm long, sericeous, tapering basally into a subulate, narrow, weak apex. Petals light, lemon-yellow or apical part of standard ± violet; wings and keel with claws somewhat shorter than the blades. Standard blades almost circular, 6.8-8 x (6.2-)7-7.5 mm, obtuse to retuse, with triangular-obtuse ears at the base, silky sericeous on the back, glabrous on the front. Wing blades 6-7 x 2-2.5 mm, glabrous, broadest at the base, with few rows of small folds on the basal half. Keel blades lunate, 5.2-6 x 2.3-3 mm, obtuse, glabrous, with ± straight upper margin. Pistil sericeous to tomentose on ovary and style base and also on upper basal two-thirds of the style; ovules 2. Pod rhombic-lanceolate, 10.5-11.5 x 4.8-5.3 mm, white-tomentose.
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Like A. glabrescens but leaves much longer, 20-35 mm, and more densely silky and calyx lobes shorter and pointed.