Plants 50-250 cm. Basal leaves caducous. Heads to 30. Ray florets 20-30+. Disc florets 125-175. 2n = 14. pappi 0.5-2 mm. 2n = 14. Flowering summer. Prairies, fencerows, roadsides; 0-400 m; Ark., Kans., La., Mo., Okla., Tex. 6-8.5 × 4-7 mm.