| Name | Alnus tenuifolia f. incisa W. A. Weber |
| Authorship | W. A. Weber |
| Rank | Forma |
| NomenclaturalStatus | NomLeg |
| Placed in | Alnus tenuifolia Nuttall |
| GUID | urn:lsid:ipni.org:names:9464-2 |
| Citation | 1979 Phytologia 41: 486 |
| Holdings | 4 Specimens held in the Harvard University Herbaria identified as Alnus tenuifolia f. incisa W. A. Weber |
| Identification made in | [no date] (4) |
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