Perennials or biennials, 40–100+ cm; fibrous-rooted (caudices erect, stout). Stems 1, glabrous or leaf axils tomentose. Basal leaves (and proximal cauline) petiolate; blades spatulate to obovate (pinnately lobed, terminal lobes ovate to oblong, lateral lobes 2–6+ pairs, smaller, midribs narrowly winged), 100–300+ × 20–50(–80+) mm, bases contracted to tapering, ultimate margins crenate or dentate to lacerate (faces glabrous). Cauline leaves gradually reduced (petiolate or sessile; obovate, irregularly incised to subpinnate, terminal lobes narrow). Heads 15–50+ in corymbiform arrays. Peduncles usually ebracteate (rarely with 1–2 bractlets), glabrous. Calyculi inconspicuous. Phyllaries 13 or 21, green, 7–9+ mm, glabrous. Ray florets 8–10+; corolla laminae 10–15+ mm. Disc florets 45–60+; corolla tubes 3–3.5 mm, limbs 4–4.5 mm. Cypselae 2–2.5 mm, glabrous; pappi 6–7 mm. 2n = 46.
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