Annuals, (5–)10–25(–40) cm. Stems 1–5+, erect to ascending, branched from bases and distally, sparsely leafy, usually ± stipitate-glandular, sometimes sparsely arachnose or glabrous (sometimes glaucous). Cauline leaves: proximal obovate to oblong, usually pinnately lobed (lobes 3–8 pairs, oblong or triangular to linear, apices obtuse to acute), ± fleshy, ultimate margins dentate, faces usually glabrous, sometimes sparsely arachnose; distal reduced (± elliptic, then pinnately lobed, to linear, bases narrowly cuneate, margins usually dentate, sometimes entire). Calyculi of 8–12+, lance-ovate to lanceolate bractlets, hyaline margins 0.5–0.2 mm wide (faces sometimes stipitate-glandular). Involucres ± campanulate, 8–14 × 4–5 mm. Phyllaries 12–20+ in 2–3 series, lance-oblong to lance-linear (apices acuminate), hyaline margins 0.05–0.3 mm wide, faces glabrous or stipitate-glandular. Receptacles sparsely bristly. Florets 58–93; corollas medium yellow, 14–20 mm; outer ligules exserted 7–10 mm. Cypselae cylindro-fusiform, 2.5–4 mm, ribs extending to or beyond apices, 5 more prominent than others (often winglike); pappi persistent, of 12–15 blunt teeth plus 0–6 bristles. Pollen 70–100% 3-porate. 2n = 14.
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