A procumbent or decumbent shrublet rather sparingly branched; main branches stout, creeping on (or below) soil surface, basally up to 5 mm thick. Young branches ascending, short-and white-villous (more slender than in A. calcarea), with prominent, villous, short-shoot tubercles. Leaflets linear-subulate, narrow, 2.5-5 mm long, glabrous, subterete, ± incurved, tapering, apically acicular. Inflorescences unifloral, on lateral short-shoots, few together near branch ends. Bract subulate, 0.3-1 x ±0.1 mm, puberulous. Pedicel 0.6-1.5 mm long, short-tomentose. Bracteoles tooth-like, up to 0.2 mm. Calyx tube campanulate, ±2 mm long, ± purplish, short-tomentose; lobes distinctly demarcated from tube, narrowly subulate, 2.2-4.5 mm long, ±0.25 mm thick (near middle), glabrous, slightly incurved, tapering. Petals yellow or ± rose. Standard blade broadly elliptic, 6.5-8 x 6-7.5 mm, acute to acuminate with a ± distinct 'tip', sparsely puberulous on apical half of back. Wing blades 3.5-5.3 x 1.8-2.4 mm. Keel blades lunate, 5.5-6.3 x 2.8-3.6 mm, with ± straight upper margin. Pistil densely sericeous on ovary and ciliate on upper side of basal half. Pods not seen.
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Prostrate shrublet. Like ?. calcarea but flowers larger, standard blade 6.5-8.0 mm long keel upper margin straight, calyx lobes as long as wings.