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 and as an invalid name (record 21772) with original publication details: Enum. Hort. Berol. Alt. 2: 401 1822.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:295222-1.
This name was in version 1 of The Plant List, record kew-21772.