Annuals, (10–)25–70(–150) cm. Leaves: petioles (narrowly, if at all, winged) 10–35+ mm; blades lance-ovate to lanceolate, (20–)35–100+ × 5–25+ mm, sometimes with 1–4 lobes near bases, bases cuneate, margins serrate, seldom ciliate, apices attenuate, faces glabrous. Heads borne singly or in 2s or 3s. Peduncles 10–35+ mm. Calyculi of (2–)3–5 ± erect, oblanceolate to linear, ± foliaceous bractlets or bracts 7–25(–70+) mm, margins sometimes obscurely ciliate, abaxial faces glabrous. Involucres usually cylindric to campanulate, rarely hemispheric, (4–)8–10(–12) × (4–)7–9 mm. Phyllaries 5–6, oblong to lance-ovate, 8–13 mm. Ray florets usually 0, sometimes 1–3+; laminae yellow-orange, 2–5(–10) mm. Disc florets 7–30+; corollas yellowish, 2.5–3.5 mm. Cypselae blackish to purplish or red-brown, ± flattened, sometimes 3–4-angled, narrowly oblanceolate, outer 5.5–10 mm, inner 6.5–11 mm, margins barbed or ciliate (proximally antrorsely, distally retrorsely), apices ± truncate, faces ± 1-nerved, glabrous or sparsely setulose, often ± striate and/or tuberculate; pappi of 2–4(–5) erect to spreading, antrorsely or retrorsely barbed awns 3–4.5 mm. 2n = 48.
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Glabrous annual 2–7 dm; lvs lanceolate, long-acuminate, serrate, often with 1 or 2 prominent lateral lobes, the blade 4–12 cm × 7–20 mm, attenuate into a slender or wing-margined petiole 1–3.5 cm; heads erect, discoid or shortly radiate, subcylindric to narrowly campanulate, the disk 5–12 mm wide, the fls 7–30; outer invol bracts mostly 3–5, foliaceous, narrow, erect and surpassing the disk; achenes flat or compressed-quadrangular, ± striate and with a strong median rib on each face, smooth except for a few scattered appressed hairs, 6–11 × 1–2 mm; pappus of 2–4 retrorsely or antrorsely barbed awns, mostly less than half as long as the achene, sometimes much reduced; 2n=48. Estuaries; Que. to N.Y. Aug., Sept.
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