Annuals, 40–100 cm. Stems erect, usually sparsely strigose, sometimes hispid as well. Leaves mostly cauline; opposite (proximal) or alternate; petioles 0–0.2 cm; blades (± 3-nerved distal to bases) narrowly lanceolate to linear, 5–11.5 × 0.15–1 cm, bases cuneate, margins entire (often ± ciliate proximally), faces sparsely strigose or scabrous to glabrate, sparsely gland-dotted. Heads usually 5+. Peduncles 1–10 cm. Involucres hemispheric, 5–6 mm diam. Phyllaries 11–17, linear, 5.5–8 × 0.8–1.3 mm (margins sparsely hispido-ciliate, hairs 0.5–1.2 mm), apices acute to acuminate, abaxial faces glabrate, not gland-dotted. Paleae (ovate) 3.5–4.6 mm, entire (1-toothed). Ray florets 7 –8; laminae (10–)15–20 mm. Disc florets 30+; corollas 2.8–3.5 mm, lobes yellow; anthers dark, appendages dark. Cypselae 2.2–2.3 mm, sparsely puberulent (bases and apices); pappi 0. 2n = 34.
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