Annuals, stem 30–200 cm tall, glabrous or sparsely puberulent, sometimes scabridulous. Leaves sessile or on 0.5–2 (–2.5) cm long, dilated petioles, lamina bipinnate, 6–11 cm long, 3–6 cm wide, ultimate segments narrowly linear, 5–30 mm long, 1–1.5 mm wide, margins entire, apices acute. Capitula solitary, 3–6 cm across. Peduncles 10–20 cm long. Phyllaries 2–seriate, outer ones, ca 8, with ovate base, inner ones linear to broadly lanceolate, 8–10 mm long, 4–5 mm wide, acute – obtuse. Paleae 8.5–10 mm long, narrowly elliptic below, linear above. Ray florets many, white, pink, or purplish, ligules obovate to oblanceolate, 15–50 mm long, 15–20 mm wide, apices ± truncate, dentate. Disc corollas 5–7 mm long with 5 teeth at the apex. Cypselas curved, 4 angled, linear fusiform, 7–12 (–16) mm long, glabrous–papillose with 1–5 mm long beak. Pappus absent or of 2–3 ascending to erect, 1–3 mm long awns.