A strong, erect (? metres high), shrub with spreading, straight, rigid branches terminating in strong thorns; lateral branches ending as axes of the inflorescences (racemes). Leaflets linear-subfiliform, slender, (3-)5-12(-15) mm long, weak, ± curved, subterete, green, subglabrous, acute to mucronulate (mucro up to 0.3 mm long). Inflorescences terminating the branches (their axes later forming the branch thorns), racemose, 2 or 3-flowered, the flowers up to 4 mm from each other. Bract subulate, 0.6-1.2 mm long, rigid, pointed, adaxially puberulous, otherwise glabrous. Pedicel ±1.5 mm long, densely short-tomentose. Bracteoles 0.5-0.8 mm long. Calyx tube puberulous; lobes triangular, 1-1.5 mm long, green, subglabrous, spine-tipped. Petals rather large, bright yellow, partly pubescent on both front (inside) and back (outside). Standard blade obovate, 8.2-9.2 x 6,0-6.5 mm, with narrow base and retuse-rounded apex; sericeous on most of the back and also on the central (most) parts of the front. Wing blades oblong-spathulate, 6.4-7 x ±2 mm, ± sericeous on lower half. Keel blades 'boomerang-shaped', forming an angle of ±100°, 7-7.5 x 2-2.3 mm, upper-apical part rounded, upper margin concave; sericeous on most parts. Pistil sericeous on upper parts of ovary and style base; ovules 2; stigma regular, capitate. Ripe pods not seen.
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Like A. acuminata but standard silky on both surfaces.