| Name | Carduus pycnocephalus Linnaeus |
| Authorship | Linnaeus |
| Rank | Species |
| Placed in | Carduus Linnaeus |
| Citation | 1763 Sp. Pl., ed. 2. 2: 1151 |
| Holdings | 8 Specimens held in the Harvard University Herbaria identified as Carduus pycnocephalus Linnaeus |
| Identification made in | [no date] (8) |
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