An erect or ascending shrub (0.2-)0.4-0.6 m tall, rather similar to A. costulat, but smaller, with more densely set, narrower leaves, smaller flowers and shorter pods. Leaflets linear, 1.5-3 mm long, 0.4-0.7 mm thick, acute (-obtuse). Flowers up to ±6 per branch end, below the leafy tips. Bract linear-oblanceolate, 1.3-2.3(-2.8) x 0.4-0.6 mm, acute. Bracteoles similar to the bract but narrower, 1.3-2.2(-3) x 0.3-0.5 mm. Calyx tube cylindrical, narrow, glabrous; lobes narrowly triangular, (1.5-)1.8-2.5 mm long, acuminate, apically ± incurved, green. Petals rose or pale purple (whitish when dry), glabrous (except on the standard base). Standard blade elliptic, 5.5-7.5(-8) x 4.5-6(-7.8) mm, acute. Wing blades 5.3-7(-8) x 1.8-2.5 (-3.5) mm. Keel blades 4.8-6.3 (-6.8) x 2.5-3.5(-4) mm. Pistil pubescent on upper side of ovary; ovules 2. Pod broadly rhombic-ovate, ±6 x 4 mm, thick, subglabrous, ± smooth, becoming black.
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Like A. costulata but calyx lobes narrowly triangular to awl-shaped with tips ± incurved.