Helianthus microcephalus Torr. & A.Gray

Perennials, 20–200 cm (with crown buds). Stems erect, glabrous. Leaves cauline; opposite or alternate; petioles 0.3–3 cm; blades (greenish, at least abaxially, 3-nerved at bases) lanceolate, 7.2–15.5 × 1.3–4 cm, bases cuneate, margins entire or serrate, abaxial faces tomentulose, densely gland-dotted. Heads (1–)3–15+. Peduncles 1–3(–8) cm. Involucres cylindric, 5–7 mm diam. Phyllaries 12–17, lance-linear, 3–6.5 × 1.5–2.5 mm, (margins ciliate) apices acuminate, abaxial faces glabrate, not gland-dotted. Paleae 5–7 mm, 3-toothed (apices hairy). Ray florets 5–8; laminae 10–14 mm. Disc florets 15–22; corollas 4–5.5 mm, lobes yellow; anthers dark, appendages dark. Cypselae 3.5–4.2 mm, glabrous; pappi of 2 aristate scales 1.5–2.2 mm. 2n = 34.