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8b. Silphium radula Nuttall var. gracile (A. Gray) J. A. Clevinger, Novon. 14: 277. 2004.
Slender rosinweed
Silphium gracile A. Gray, Proc. Amer. Acad. Arts 8: 653. 1873
Plants 30–100 cm. Basal leaves persistent. Heads to 15. Ray florets 12–18. Disc florets 100–150. 2n = 14.
Flowering summer. Prairies, fencerows, roadsides; 0–300 m; La., Tex.
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