| Name | Piper celtidiforme f. usteri (C. de Candolle) Quisumbing |
| Authorship | (C. de Candolle) Quisumbing |
| Rank | Forma |
| Placed in | Piper celtidiforme Opiz |
| Citation | 1930 Philipp. J. Sci., C. 43:181 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Piper celtidiforme f. usteri (C. de Candolle) Quisumbing |
| Identification made in | [no date] (1) |
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