Annuals, 10–100(–150) cm. Stems solid. Leaves: proximal blades usually entire, sometimes serrate, faces pubescent and stipitate-glandular. Heads usually in glomerules or ± crowded, sometimes in open, paniculiform arrays. Bracts subtending heads usually overlapping proximal 0–1/2+ of each involucre. Phyllaries ± evenly stipitate-glandular, including margins and apices, usually with non-glandular, non-pustule-based hairs as well. Paleae in 1 series. Ray florets 5; laminae deep yellow, 4–7 mm. Disc florets 6, functionally staminate or bisexual; anthers yellow or brownish. Pappi of 5–9 (often ± connate, irregular), subulate to quadrate, erose scales 0.1–0.6 mm. 2n = 22.
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