This name is a synonym of Alnus alnobetula subsp. sinuata (Regel) Raus.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 6618) with original publication details: Ill. Handb. Laubholzk. 2: 888 1912.
This name was in version 1 of The Plant List, record kew-6618.