An erect or suberect shrub, 0.2-0.5(-1) m tall, rather densely branched, occasionally almost cushion-like. Branches strong, rigid, spreading, when old then persisting as pungent thorns; young branches puberulous. Leaflets short, linear-oblong to oviform, conical or subglobose, 0.5-3(-5) mm long, terete, apiculate to mucronate, glabrous to grey-puberulous. Flowers solitary or in pairs near the tips of branches (ending beyond the flower in a thorn) or on the tips of short, sometimes almost leafless, lateral branchlets. Bract and bracteoles ovate to subulate, small, 0.8-1.8 mm long, apiculate-mucronulate, subglabrous or puberulous. Pedicel (1.1-)1.5-2 mm long, short-pubescent. Calyx tube campanulate, densely puberulous; lobes triangular, 1.2-2 mm long, greenish, puberulous to subglabrous, ending in a sharp spinelet. Petals pale yellow, turning sombre violet when fading. Standard ovate, (6.4-)8.2-10.4 x (4.2-)4.6-6.5 mm, ± recurved at the base; apex incurved, acute; sides ± incurved; back densely short-sericeous. Wing blades very short, ovate-elliptic, (1.5-)2.4-4.6 x (1.2-)1.7-2.1 mm, with some pubescence on lower parts and 5-6 rows of minute folds covering most of outer side. Keel 'boomerang-shaped', angled, relatively large, (5.5-)6.5-9.2 x (2.3-)2.6-3 mm, apically obtuse, sericeous on most of outside (upper, concave margin glabrous). Pistil pubescent on upper parts of ovary and style base. Ripe pods not seen.
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Suberect, rigid, spreading, densely branched shrub, 0.2-0.5(-1) m tall, branches thorny when old. Leaves 3-foliolate, leaflets linear-oblong to conical or ± globose, sharp-tipped, short, glabrous or grey hairy. Flowers solitary or paired near branch tips, pale yellow, calyx hairy, lobes broad at base, spinelet-tipped, standard basally recurved, apex incurved, densely silky on back, keel boomerang-shaped, silky.
Like A. acuminata but wings very short, to half as long as boomerang-shaped keel.
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