Erect herbs to c. 1.5 m high, not leafier in lower 1/3 at anthesis. Taproot inconspicuous; secondary roots fleshy. Stems ± glabrous basally, sometimes becoming somewhat appressed-cottony upwards and then becoming glabrous. Leaves very narrowly elliptic to linear, 6–24 cm long, with l:w ratio c. 12–40, undivided; base without auricles or uppermost leaves with small projections; margin usually with numerous small teeth; both surfaces glabrous or sparsely appressed-cobwebby; lower surface not purple. Capitula numerous per stem; calycular bracteoles 4–8, 1–2 mm long; peduncle and bracteoles moderately cobwebby at anthesis; involucre 5–8 mm long, 1.8–2.2 mm diam.; bracts mostly 12–14, often sparsely cobwebby, becoming glabrous. Florets 30–50. Achenes bottle-shaped, often curved, 2.5–4 mm long, the majority dark brown, with papillose hairs scattered in lines; l:w ratio of hairs c. 1–2. Pappus 5–6 mm long.
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