| Name | Cirsium undulatum var. megacephalum (A. Gray) Fernald |
| Authorship | (A. Gray) Fernald |
| Rank | Variety |
| NomenclaturalStatus | NomLeg |
| Placed in | Cirsium undulatum (Nuttall) Sprengel |
| GUID | urn:lsid:ipni.org:names:1179376-2 |
| Holdings | 5 Specimens held in the Harvard University Herbaria identified as Cirsium undulatum var. megacephalum (A. Gray) Fernald |
| Identification made in | [no date] (2), 1911 (3) |
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