| Name | Rhododendron japonicum var. pentamerum (Maximowicz) Hutchinson |
| Authorship | (Maximowicz) Hutchinson |
| Rank | Variety |
| Placed in | Rhododendron japonicum C. K. Schneider |
| Citation | 1911 Bot. Mag. 137: t. 8403 |
| Holdings | 7 Specimens held in the Harvard University Herbaria identified as Rhododendron japonicum var. pentamerum (Maximowicz) Hutchinson |
| Identification made in | [no date] (7) |