Annuals, (30–)50–120 cm. Leaves sessile or petioles 10–50 mm (winged); blades lance-elliptic to lance-oblong, 80–120(–250) × 30–100 mm (proximal usually with 1–2 lobes near bases), bases cuneate, margins laciniate to serrate, ciliate, apices acuminate, faces glabrous. Heads in ± corymbiform arrays. Peduncles (10–)30–70+ mm. Calyculi of 8–10 usually spreading, lance-linear to lanceolate, sometimes ± foliaceous bractlets or bracts 10–20(–75) mm, margins entire or incised, ciliate, abaxial faces ± hispid at bases. Involucres ± hemispheric or broader, 6–10 × 18–25 mm. Phyllaries 13–16+, oblong to lance-ovate, 6–10 mm. Ray florets 6–11; laminae yellow, 4–8 mm. Disc florets 50–100+; corollas yellow, 2.5–3.5 mm. Cypselae olivaceous green, ± flattened, unequally 3–4-angled, cuneate, outer 5–6 mm, inner 6–7 mm, margins antrorsely to retrorsely barbed, apices truncate to concave, faces weakly striate, glabrous or sparsely puberulent; pappi 0, or of (1–)3(–4) suberect, retrorsely barbed awns 2–4 mm.
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