Silphium wasiotense Medley

Plants caulescent, 60–150 cm; fibrous rooted. Stems terete, hispid (never glaucous). Leaves: basal persistent, petiolate; cauline opposite, petiolate (proximal) or sessile (distal); blades cordate, deltate, lanceolate, or ovate, 1–28 × 1.5–20 cm, sometimes (proximal) lobed, bases auriculate, cordate, or truncate (proximal and distal), ultimate margins toothed or entire, apices acute to acuminate, faces hispid. Phyllaries 12–14 in 2–3 series, outer reflexed, apices acute to obtuse, abaxial faces hispid. Ray florets 6–14; corollas yellow. Disc florets 30–45; corollas yellow. Cypselae 4–8 × 4-6 mm; pappi 0.5–1.5 mm.