Erect, perennial shrublet, 0.1-0.7(-1.2) m high. Branchlets short-tomentose. Leaves 3-12 together on young branches. Leaflets 1.0-4.5 mm long, subfiliform to sausage-shaped, subterete, obtuse to subacute, glabrous or hairy. Flowers slate-blue to violet; petals shortly pilose on most of back. Calyx: tube shortly pilose; lobes obtuse to subacute, < 3 mm long. Inflorescences: spikes or heads, elongate to subcapitate with 4-15(-20) flowers. Flowering time Aug.-Nov.
Shrublet to 70 cm, like A. cephalotes but bracts < 3.5 mm, calyx lobes mostly < 3 mm and flowers usually slate-blue to violet.