| Name | Carduus floccosus Rydberg |
| Authorship | Rydberg |
| Rank | Species |
| Placed in | Carduus Linnaeus |
| Citation | 1905 Bull. Torrey Bot. Club 32: 133 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Carduus floccosus Rydberg |
| Identification made in | [no date] (1) |
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