Annuals or short-lived perennials, 6–30(–40) cm; taprooted, caudices simple or branched. Stems decumbent-ascending to erect (branched), usually sparsely strigose (hairs rarely ascending-spreading), sometimes sparsely hirsutulous distally, sometimes sparsely glandular, sometimes minutely glandular distally. Leaves basal (persistent) and cauline; basal blades oblanceolate-spatulate to spatulate, 10–70 × 2–8(–13) mm, margins usually entire, sometimes dentate or pinnately divided, faces sparsely strigose, eglandular; cauline blades linear to oblanceolate, reduced distally. Heads 1–50+ in diffuse arrays (first 1 per branch, later more from axillary branches). Involucres 2–3.5 × 5.5–7.5 mm. Phyllaries in 3–5 series, sparsely to moderately hirtellous, minutely glandular. Ray florets 37–85; corollas white, drying lilac, with abaxial lilac midstripe, 3.5–7 mm; laminae not coiling or reflexing. Disc corollas 1.6–2.4 mm (throats slightly indurate and inflated). Cypselae 0.8–1.2 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of 6–12 bristles. 2n = 18, 27.
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