A decumbent to ascending shrublet with 0.2-0.35 m long branches rarely reaching above 0.2 m above the ground, sparingly branched. Young branches reddish and short-tomentose(-villous). Leaflets linear, 2-8 mm long, acute, subterete or angular, often slightly curved, pale greyish green, glabrous or often sparsely pubescent. Inflorescences unifloral, on lateral short-shoots or on short branchlets. Flowers medium-sized. Bract simple or occasionally trifoliolate, similar to vegetative leaflets (leaves); 3.2-4.5(-7) mm long, almost triangular in transverse section. Pedicel 0.4-1 mm, pubescent. Bracteoles similar to the (simple) bract, (3.2-)4-6.5(-7.5) mm long. Calyx tube densely short-tomentose; lobes linear or very narrowly lanceolate, 5-7(-10) mm long and 0.9-1.2(-2) mm broad, pale or greyish green, with distinct margins and midvein, weak, acuminate, sparsely pubescent. Petals yellow, becoming ferruginous or reddish. Standard blade circular or broadly (ob)ovate, 7.5-10(-10.5) x 8.5-11(-11.5) mm, densely short-sericeous on the back, glabrous on the front, the apex with a 0.3-1 mm long 'tip'. Wing blades obovate-elliptic, (4-)5-6(-6.6) x 2-2.3 mm. Keel blades lunate, 6-7(-7.4) x 3-3.8 mm, glabrous, with slightly convex upper margin. Pistil with tomentose ovary. Pod triangular-ovate, 5.5-6 x ±4 mm, smooth, tomentose on most parts.
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Like A. linguiloba but flowers larger, calyx lobes usually > 6 mm and keel blades usually > 8 mm.