| Name | Pleiacanthus spinosus (Nuttall) Rydberg |
| Authorship | (Nuttall) Rydberg |
| Rank | Species |
| Placed in | Pleiacanthus (Nuttall) Rydberg |
| Holdings | 17 Specimens held in the Harvard University Herbaria identified as Pleiacanthus spinosus (Nuttall) Rydberg |
| Identification made in | [no date] (15), 2015 (2) |
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