Annuals or short-lived perennials, 30–70 cm; taprooted. Stems erect, coarsely hirsute to hispid (hairs only along ribs, bases thickened), minutely glandular. Leaves mostly cauline; blades linear to linear-oblong,-lanceolate, or-oblanceolate (slightly narrowed distally), 25–50 × 2–5 mm, margins entire or sometimes lobed (lobes 1–2 pairs, coarse, rounded), faces hispido-strigose. Heads 20–50+ in loose, corymbiform arrays (buds erect). Involucres 2.5–3.5 × 5–8 mm. Phyllaries in 3–4 series, minutely hispid, minutely glandular. Ray florets 125–180; corollas usually white, sometimes lavender or pinkish, 6–7 mm, laminae reflexing. Disc corollas 2–2.5 mm (throats indurate and inflated). Cypselae 0.7–1 mm, 2-nerved (nerves orange), faces sparsely strigose to glabrate; pappi: outer of setae or lanceolate scales, inner of (10–)12–17 bristles. 2n = 18.
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