⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record kew-6341, and has not been changed.

Alnus firma var. sieboldiana (Matsum.) H.J.P.Winkl. is a synonym of Alnus sieboldiana Matsum.

This name is a synonym of Alnus sieboldiana Matsum..

The record derives from WCSP which reports it as a synonym (record 6341) with original publication details: Pflanzenr. IV, 61: 104 1904.