| Name | Hydrangea arborescens f. grandiflora Rehder |
| Authorship | Rehder |
| Rank | Forma |
| Placed in | Hydrangea arborescens Linnaeus |
| Citation | 1907 Mitt. Deutsch. Dendrol. Ges. 16: 71 |
| Holdings | 4 Specimens held in the Harvard University Herbaria identified as Hydrangea arborescens f. grandiflora Rehder |
| Identification made in | [no date] (3), 1950 (1) |
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