| Name | Cirsium rydbergii Petrak |
| Authorship | Petrak |
| Rank | Species |
| Placed in | Cirsium Miller |
| Citation | 1917 Beih. Bot. Centralbl., Abt. 2. 35(2[2/3]): 315–317 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Cirsium rydbergii Petrak |
| Identification made in | 1960 (1) |
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