An erect shrub, 0.6-2 m tall or more, greatly resembling A. hirta, but larger in most respects. Leaflets needle-like, 5-18 mm long, straight, glabrous, either rather long and slender (Langeberg forms) or shorter and relatively thick (Aasvogelberg forms). Bract lanceolate-subulate, 2.5-4.5 mm long, pubescent on lower half, the apical half comprising a spinelet. Pedicel 2-3 mm long, white-woolly. Bracteoles 3-5.5 mm long. Calyx tube globose, villous or short-woolly; lobes only 2-3 mm long, consisting for the most part of a ±1-5 mm long spinelet. Petals bright yellow. Standard blade obovate, 15.5-19 x 14-18.5 mm, densely sericeous or almost woolly on the back, glabrous on the front (except a basal hair tuft). Wing blades glabrous, 13-17 x 4.2-6 mm. Keel blades lunate, 13-16 x 5.2-7.2 mm, obtuse, glabrous; upper margin slightly concave. Pistil densely woolly on the ovary, glabrous on the style; ovules 3-5. Pod broadly lanceolate, 17-19 x 8-9 mm, grey-woolly.
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Like A. hirta but flowers larger, wing and keel blades 13-17 mm long.