Annuals, 50–200 cm. Stems single, branches ascending or spreading, glabrous. Leaves withered at flowering (glabrous). basal blades linear to oblanceolate, runcinate. 3–10 cm, margins pinnately lobed. cauline much reduced, bractlike . Heads borne singly or clustered along branches . Peduncles 3–4 mm. Calyculi of reflexed bractlets. Involucres 7–9 mm (sparsely glandular-puberulent). Florets 11–13. Cypselae light tan to brown, 1.9–2.3 mm, faces smooth, slightly bumpy or tuberculate, grooved; pappi of 19–21, white bristles (falling), plumose on distal 80–85%. 2n = 16.
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