This name is a synonym of Betula pubescens var. glabrata Wahlenb..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 21189) with original publication details: Bot. Zhurn. (Kiev) 3: 18 1947.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:107726-1.
This name was in version 1 of The Plant List, record kew-21189.