Perennials, to 125+ cm; fibrous rooted (arising from stout rhizomes or woody caudices). Leaves 5-40 × 3-15+ cm, pinnatifid to pinnate, lobes 3-9, narrowly lanceolate to ovate, 1-15 × 0.2-3.5 cm, faces strigose, gland-dotted. Heads mostly 1-12, held well beyond leaves. Peduncles 3-27+ cm (ribs tan, prominent). Phyllaries 10-15, outer linear, 3-15 × 1-3 mm, inner lanceolate-ovate, 3-6 × 0.7-3 mm. Paleae 1.2-5 × 1-1.8 mm, resin glands linear to oblanceolate, 2-3.3 mm. Ray florets 6-15; corollas yellow, 2.5-3.8 mm, tubes ca. 1-3 mm, hirsute, laminae linear-elliptic to oblong-oblanceolate, 16-60 × 4-15 mm. Discs ellipsoid to globular or ovoid, 10-25 × 10-18 mm. Disc florets 100-200+; corollas greenish yellow, often purplish distally, 2.5-3.8 mm; style branches ca. 1.8 mm, proximal ¹/2 stigmatic, apices subulate. Cypselae linear-oblanceoloid, 2-4 × 1-2.3 mm, margins usually glabrous, sometimes adaxial ciliate; pappi 0 or of 1-2 toothlike projections. 2n = 28. Flowering May-Oct. Prairies, woodland openings and borders, limestone outcrops; 10-300 m; Ont.; Ala., Ark., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Mass., Mich., Minn., Miss., Mo., Nebr., N.Y., Ohio, Okla., S.Dak., Tenn., Vt., Wis.