| Name | Silphium radula var. gracile (A. Gray) Clevinger |
| Authorship | (A. Gray) Clevinger |
| Rank | Variety |
| Placed in | Silphium radula Nuttall |
| Citation | 2004 Novon 14(3): 277 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Silphium radula var. gracile (A. Gray) Clevinger |
| Identification made in | [no date] (1), 1999 (1) |
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