| Name | Cirsium horridulum var. megacanthum (Nuttall) D. J. Keil |
| Authorship | (Nuttall) D. J. Keil |
| Rank | Variety |
| Placed in | Cirsium horridulum Michaux |
| Citation | 2004 Sida 21(1): 214 |
| Holdings | 17 Specimens held in the Harvard University Herbaria identified as Cirsium horridulum var. megacanthum (Nuttall) D. J. Keil |
| Identification made in | [no date] (13), 1997 (4) |
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