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8a. Silphium radula Nuttall var. radula
Silphium reverchonii Bush; S. simpsonii Greene var. wrightii L. M. Perry
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.
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