"Annual 1–4 dm from a ± evident taproot, leafy throughout, sparsely crisp-hairy or subglabrous; lvs coarsely and irregularly toothed to more often pinnatifid, 2–10 × 0.5–4.5 cm, the lower tapering to the petiole or petiolar base, the upper sessile and clasping; heads several or many, discoid, the fls all tubular and perfect; disk 5–10 mm wide; invol 5–8 mm, with ca 21 principal bracts and some short but well developed, black-tipped bracteoles; pappus very copious, from a little shorter than to equaling or generally surpassing the cors; achenes short-hairy chiefly along the angles; 2n=40. A weed in disturbed soil and waste places; native of the Old World, now widely distributed in n. temp. regions, and throughout our range. May–Oct."
Capitula discoid, in congested terminal corymbs; stalk of individual heads with long white pubescence, glabrescent; involucre cylindrical, 7–8 mm long, 2.5 mm in diameter; bracts of calyculus ± 8, imbricate, lanceolate, glabrous, up to 2 mm long; phyllaries ± 19, glabrous, 6.5–7.5 mm long.
Basal leaves sessile, oblanceolate or oblanceolate-elliptic in outline, tapered into an expanded exauriculate petioloid base, pinnately toothed or lobed, rounded, soon disappearing; stem leaves sessile, oblong to broadly oblong in outline, auriculate, semi-amplexicaul, shortly to deeply pinnately lobulate with oblong to oblong-linear, apiculate-dentate lobes, 2.3–6 cm long, 0.15–0.6 (–1–1.7 cm across the lobes) cm wide; all leaves with scattered long white hairs above on midrib and beneath especially on midrib.
Stems at first white-pubescent, glabrescent.
Achenes 2.5 mm long, ribbed, hairy in the grooves; pappus 5–5.5 mm long.
Ray florets 0; disc florets yellow, corolla 5 mm long, tube expanded in the upper 1/3, glabrous, narrowly tubular below, lobes 0.5 mm long.
Erect, subglabrous annual or biennial to 40 cm. Leaves oblong-oblanceolate, irregularly lacerate-pinnatifid, lower petiolate, upper auriculate. Flower heads discoid, in leafy corymbs, yellow, involucre calycled; florets with lower slender portion of tube 3x as long as upper inflated portion.