Plants (2–)10–80(–100) cm (in extensive, lax clones; rhizomes superficial, elongate, herbaceous or woody, simple). Stems 1, erect, stout (2–4 mm diam.), flexuous, simple, ± densely villosulous, eglandular. Leaves 11–18, sometimes ± crowded distally (often seemingly whorled), proximal often withering by flowering; sessile or winged-subpetiolate; blades obovate to oblanceolate, (20–)60–150(–170) × (2–)10–45(–50) mm, bases cuneate to attenuate, margins flat, serrate distally, teeth sharp, acuminate, ciliate, apices acuminate, faces sparsely villosulous (abaxial mostly along veins and very sparsely stipitate-glandular; array leaves reduced distally). Heads (1–)5–46(–61+) in open corymbiform arrays, branches arching-ascending, at nearly right to ± acute angles with stems. Peduncles thin, 0.9–4.5 cm, densely villosulous, eglandular; bracts 1–2, linear, sparsely villosulous. Involucres 5–10 mm. Phyllaries linear-lanceolate to linear, sparsely villosulous or glabrous, sparsely gland-dotted. Ray florets (9–)15(–18); corollas white, seldom pinkish, 15–20 × 1.4–2 mm. Disc florets 14–30; corollas ampliate, 5.5–7.5 mm, sparsely glandular; tubes shorter than narrowly campanulate, sparsely strigillose throats, lobes reflexed, 0.5–1 mm. Cypselae tan, fusiform-obconic, ± compressed, 2.8–3.6 mm, ribs 3–5 (concolorous with bodies), faces glabrous, gland-dotted; pappi of whitish bristles in 3 series, outer shorter than disc corollas (innermost attenuate). 2n = 18.
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