| Name | Rhododendron ultimum Wernham |
| Authorship | Wernham |
| Rank | Species |
| Placed in | Rhododendron Linnaeus |
| Citation | 1916 Trans. Linn. Soc. London, Bot. 9: 99 |
| Holdings | 4 Specimens held in the Harvard University Herbaria identified as Rhododendron ultimum Wernham |
| Identification made in | [no date] (4) |
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