Bot. Gaz. 37: 270. 1904.
Perennials, 5–55 (–70) cm; rhizomatous, fibrous-rooted, caudices usually simple, thick. Stems erect to ascending, hirsute or hirsuto-villous to densely strigillose (hairs loosely appressed, slightly crinkled), eglandular. Leaves basal (usually persistent) and cauline; basal blades linear-oblanceolate to broadly lanceolate or spatulate, (20–) 30–160 (–200) × 7–45 mm, cauline gradually reduced distally (bases distinctly subclasping, except when greatly reduced), margins entire, faces glabrous or glabrate, hirsute, or villous to sparsely villosulous, eglandular. Heads 1 (–8). Involucres 6–9 (–12) × 10–22 (–25) mm. Phyllaries in 2–3 (–4) series (faces and margins) usually glabrous, rarely sparsely villous (cross-walls not colored), densely and evenly stipitate-glandular. Ray-florets 30–80; corollas usually blue to rose-purple or pink, sometimes white to pale blue, 8–16 (–25) mm (mostly 1.5–3 mm wide), laminae coiling. Disc corollas 3.8–6 mm. Cypselae 2.5–2.8 mm, (4–) 5 (–7) -nerved, faces sparsely strigose; pappi: outer of setae, inner of 20–30 bristles.
Alta., B.C., Yukon, Alaska, Calif., Colo., Idaho, Mont., N.Mex., Nev., Oreg., Utah, Wash., Wyo.
Varieties 2 (2 in the flora).
"thick" is not a number.