Dioecious. Plants (1–)3–12 cm (stems usually stipitate-glandular). Stolons 1–4(–9) cm. Basal leaves 1-nerved, spatulate to linear-cuneate, 6–12 × 1.5–4.5 mm, tips mucronate, faces glabrescent-scabrous to gray-pubescent (often with purple glandular hairs). Cauline leaves linear, 3–11(–13) mm, usually not flagged (apices acute to acuminate), rarely distal flagged. Heads 4–6 in corymbiform arrays. Involucres: staminate 4–5 mm; pistillate 3.5–4.5 mm. Phyllaries (relatively wide) distally dark brown-black (sometimes light brown or whitish at very tips; apices blunt). Corollas: staminate 1.9–2.8 mm; pistillate 2–3 mm. Cypselae 0.7–1.3 mm, glabrous or slightly papillate; pappi: staminate 2.5–3.5 mm; pistillate 2.5–3.5 mm. 2n = 28 (as A. media).
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