| Name | Cirsium longistylum R. J. Moore & Frankton |
| Authorship | R. J. Moore & Frankton |
| Rank | Species |
| Placed in | Cirsium Miller |
| Citation | 1963 Canad. J. Bot. 41(11): 1562–1563, pl. 1 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Cirsium longistylum R. J. Moore & Frankton |
| Identification made in | [no date] (2) |
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