| Name | Silphium integrifolium var. speciosum (Nuttall) J. A. Clevenger |
| Authorship | (Nuttall) J. A. Clevenger |
| Rank | Variety |
| Placed in | Silphium integrifolium Michaux |
| Remarks | (ined.) |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Silphium integrifolium var. speciosum (Nuttall) J. A. Clevenger |
| Identification made in | 1999 (1) |
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