| Name | Arnica gracilis Rydberg |
| Authorship | Rydberg |
| Rank | Species |
| Placed in | Arnica Linnaeus |
| Citation | 1897 [29 Jun 1897] Bull. Torrey Bot. Club 24(6): 297 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Arnica gracilis Rydberg |
| Identification made in | [no date] (1) |
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