| Name | Eupatorium perfoliatum f. purpureum Britton |
| Authorship | Britton |
| Rank | Forma |
| Placed in | Eupatorium perfoliatum Linnaeus |
| Holdings | 6 Specimens held in the Harvard University Herbaria identified as Eupatorium perfoliatum f. purpureum Britton |
| Identification made in | [no date] (6) |
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