Plants 12–50 cm. Stems usually simple, rarely branched. Leaves 3–7 pairs, mostly cauline; petiolate (petioles, at least proximal, relatively narrow, ± equaling blades); blades narrowly to broadly lanceolate or ovate, 3.5–14 × 0.5–3.7 cm, margins regularly dentate or denticulate, apices acute, faces glabrous or moderately pilose, sparsely to densely stipitate-glandular. Heads 3–8 (erect). Involucres campanulate-turbinate. Phyllaries 6–14, lanceolate (apices acute). Ray florets 6–17; corollas yellow. Disc florets: corollas yellow; anthers yellow. Cypselae gray to brown, 3–6 mm, densely hirsute, sometimes stipitate-glandular; pappi white, bristles barbellate. 2n = 38, 57, 76.
"Stems 1.5–4 dm, solitary or sometimes loosely clustered, on a densely scaly rhizome; herbage finely stipitate-glandular and often also spreading-hairy or scabrous-puberulent, or the lvs subglabrous; lvs dentate, the lowest mostly persistent, 5–15 × 1.5–3.5 cm; middle and upper lvs few and reduced, sessile, the stem appearing sparsely leafy or subnaked; heads (1–)3–7(–9), turbinate or campanulate, the disk 1–2 cm wide; invol 8–12 mm; rays (6–)8(–10), 1–2 cm; pappus-bristles white, merely barbellate; ours apomictic triploids and tetraploids, 2n=57, 76. Rocky places, in our range chiefly or wholly in calcareous situations; cordilleran region of Can. and nw. U.S.; Ont. and ne. Minn.; N.S. to Que. and Nf. Ours are var. lonchophylla. (A. chionopappa) Var. arnoglossa (Greene) B. Boivin is restricted to Wyo. and w. S.D. (A. arnoglossa)"