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 6311) with original publication details: Canad. Field-Natuealist 71: 51 1957.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:9401-2.
This name was in version 1 of The Plant List, record kew-6311.