Silphium radula var. gracile (A. Gray) J. A. Clevinger
Family: Asteraceae
[Silphium gracile A. Gray]
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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.