| Name | Rhododendron williamsii Merrill ex H. F. Copeland |
| Authorship | Merrill ex H. F. Copeland |
| Rank | Species |
| Placed in | Rhododendron Linnaeus |
| Citation | 1929 Philipp. J. Sci. 40: 137 |
| Holdings | 8 Specimens held in the Harvard University Herbaria identified as Rhododendron williamsii Merrill ex H. F. Copeland |
| Identification made in | [no date] (8) |
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