| Name | Alstonia penangiana Sidiyasa |
| Authorship | Sidiyasa bis |
| Rank | Species |
| Placed in | Alstonia R. Brown |
| Citation | 1998. Blumea, Suppl. 11: 162. |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Alstonia penangiana Sidiyasa |
| Identification made in | 1997 (1) |