Perennials, 15–70 cm (taproots slender, caudices swollen, often covered by old leaf bases). Stems 1–2, erect, slender, usually branched distal to middles, glabrous or tomentulose. Leaves basal and cauline; petiolate; blades lanceolate to linear, 10–35 × 0.5–6 cm, margins deeply pinnately lobed (lobes narrowly lanceolate or linear, usually entire or toothed), apices acuminate, faces tomentulose to glabrate. Heads 3–30, in corymbiform arrays. Calyculi of 5–10, narrowly triangular to lanceolate, tomentose bractlets 1–3 mm. Involucres cylindro-campanulate, 10–12 × 4–7 mm. Phyllaries 8–13, lanceolate, 10–12 mm (margins yellow, scarious, eciliate), apices acute, abaxial faces usually tomentulose, sometimes glabrous, often with coarse, green or blackish setae, adaxial glabrous or with fine, appressed hairs. Florets 6–35; corollas yellow, 10–18 mm. Cypselae dark or blackish green, subcylindric, 3–10 mm, apices tapered, not beaked, ribs 12–15 (distinct); pappi whitish, 5–9 mm. 2n = 22, 33, 44, 55, 88.
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