Annuals, 50–150 cm. Stems single, branches ascending or spreading, glabrous, puberulent, or glandular-pubescent. Leaves withered at flowering (glabrous or puberulent); basal blades linear to oblanceolate, runcinate, 3–10 cm, margins pinnately lobed. cauline much reduced, bractlike. Heads borne singly or clustered along branches. Peduncles 3–7 mm. Calyculi of usually reflexed, rarely appressed bractlets. Involucres 5–7 mm (glabrous, puberulent, or stipitate-glandular). Florets 9–15. Cypselae light tan to dark brown, 2.8–4.5 mm, faces smooth to strongly tuberculate, grooved; pappi of 17–22 white or tan bristles (falling or widened bases persistent, bases connate in groups of 2–4, distal portions breaking off), wholly plumose. 2n = 32.
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