Perennial, 30–100 cm tall herbs. Leaves basal and cauline, simple or with 1–2 lateral lobes opposite, lanceolate, 15–21 cm long, petiolate or sessile; glabrous. Capitula radiate, solitary or in lax cymose panicles, on (10–) 15–30 cm long peduncles, radiate ca 1.8 cm long, ca 2 cm across. Phyllaries usually 2–3–seriate, outer ca 5 mm long, ovate, inner ones longer, ca 10 mm long, ovate –lanceolate. Receptacle flat, receptacular paleae deciduous. Ray florets uniseriate, sterile, yellow, ligules (1.5–) 2–3 cm long, lobes obovate, ca 9 mm. Disc florets 8–120, bisexual, fertile; usually yellow throughout, tubular, 5–lobed, lobes unequal, acute. Cypselas dorsally compressed, 2.5–4 mm long, broadly winged, wings membranous to papery, spreading, entire, toothed or lobed. Pappus absent, or of 1–2 persistent cusps or subulate scales.