Leaves 15-50 × 10-40 mm overall, ultimate lobes (7-)11-15, 5-20 × 1-3 mm, glabrous or sparsely hairy, dotted with oil-glands. Peduncles 1-5(-10) mm. Involucres 6-10 mm. Phyllaries each bearing 1-7 oil-glands. Ray laminae 1.5-2.5 × 1-2 mm. Disc corollas ca. 3 mm. Cypselae3-3.5 mm; pappi 1-3 mm. 2n = 26. Flowering summer-fall. Grasslands, open woodlands, often ruderal, fields, along roadways; 0-2000 m; Ont.; Ariz., Ark., Calif., Colo., Ill., Ind., Iowa, Kans., Ky., La., Maine, Mass., Mich., Minn., Mo., Mont., Nebr., Nev., N.H., N.Mex., N.Y., N.Dak., Ohio, Okla., Pa., S.Dak., Tenn., Tex., Utah, Vt., W.Va., Wis., Wyo.; Mexico; Central America; introduced in South America.

Plant: Annual generally 1-4 dm, glabrous or sparsely puberulent Leaves: opposite below, often alternate above, 2-3 cm, divided into 11-15 narrow lobes, these sometimes again divided INFLORESCENCE: primary inflorescence a head, each resembling a flower; heads radiate, 1-few in dense cymes; peduncles 1-5 mm; involucre 4-10 mm diam, bell-shaped; outer phyllaries 4-9, linear, inner phyllaries generally 8, scarious-margined, gland-dotted Flowers: Ray flowers 8 or fewer; ligules 1.5-2 mm; corollas yellow to orange; Disk flowers 25-30; corollas ± 3 mm, pale yellow; style tips truncate to conic Fruit: 3-3.5 mm, hairy, obconic or obpyramidal; pappus 2-3 mm, of scales dissected into bristles Misc: Roadsides, disturbed fields; < 350 m.