Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). Herbage glabrous or sparsely floccose-tomentose when young. Stems single or loosely clustered. Leaves evenly distributed; petiolate; blades narrowly triangular, (3–)4–10+ × 2–6 cm, bases usually ± truncate, sometimes tapered, margins usually dentate, rarely subentire (distal leaves subsessile, smaller). Heads 10–30(–60) in corymbiform to subracemiform arrays. Calyculi of 2–6 bractlets (rarely more than 2 mm). Phyllaries (± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black. Ray florets ± 8; corolla laminae 9–15 mm. Cypselae glabrous. 2n = 40, 80.
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