A procumbent, decumbent or ascending shrub, occasionally up to 1 m tall, loosely branched, with spreading, rather slender branches short-sericeous on the young parts. Leaflets spreading, linear-subulate, 2.5-8 x 0.6-0.8 mm, subterete or slightly flattened, straight or slightly recurved, glabrous, mucronulate (mucro 0.2-0.4 mm long). Flowers solitary or up to 3, on branchlet tips, when 2 or 3 then at some distance from each other; floriferous branches often with up to 10 mm long, almost peduncle-like internodes, the flower at some distance from the nearest vegetative leaf. Bract oblong-linear, 0.8-2.1 x 0.3-0.6 mm, subglabrous, mucronulate. Pedicel 1.2-2.7 mm long, ± puberulous. Bracteoles (0.3-)0.7-1.6 mm long. Calyx infundibular-campanulate, glabrous; lobes deltoid-triangular, 1-2.4 mm long, green, mucronate. Petals bright yellow, becoming orange or orange-red when fading (hence the specific name). Standard blade obovate, 8.8-10 x 5.2-8.2 mm, apically obtuse-retuse, short-sericeous on apical half or two-thirds of the back. Wing blades oblong, (4.5-)5-8.5 x (1.6-)2-3.3 mm, glabrous. Keel lunate, with obliquely squarish upper-apical parts, 7-8 x 3.5-4 mm, glabrous, rigid, with concave upper margin; basal puckering barely distinct. Pistil sericeous on ovary and style base. Pod triangular-lanceolate, ±12 x 4 mm, sparsely short-sericeous.
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Like A. biflora but flowers larger, standard blade 9-10 mm long, bright yellow, fading orange or orange-red.