Neglected sunflower

Annuals, 80–200 cm. Stems erect (leafy), ± hispid to glabrate. Leaves cauline; alternate; petioles 7–12 cm; blades deltate-ovate, 7–14 × 7.5–12.3 cm, bases usually ± cordate, sometimes truncate , margins subentire to serrulate, abaxial faces strigose, not gland-dotted. Heads 1–5. Peduncles 10–40 cm. Involucres ± hemispheric, (23–28 ×) 10–14 mm. Phyllaries 25–35, lanceolate, 14–25 × 2.3–4 mm (surpassing discs), apices long-attenuate, abaxial faces strigillose to hispid. Paleae 9–10 mm, 3-toothed (middle teeth ± ciliate or bearded, hairs whitish, 0.3–0.6 mm). Ray florets 21–31; laminae 29–39 mm. Disc florets 150+; corollas 6–6.5 mm, lobes reddish; anthers dark, appendages purplish (style branches reddish). Cypselae 4–5 mm, strigillose to glabrate ; pappi of 2 aristate scales 2.8–3.2 mm. 2n = 34.

Flowering summer–fall. Sandy soils, sand dunes; of conservation concern; 800–1100 m; N.Mex., Tex.