| Name | Begonia lagunensis Elmer |
| Authorship | Elmer |
| Rank | Species |
| Placed in | Begonia Linnaeus |
| Citation | 1910 Leafl. Philipp. Bot. 2: 735 |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Begonia lagunensis Elmer |
| Identification made in | [no date] (3) |