This name is a synonym of Betula × caerulea Blanch..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 21197) with original publication details: Betula 1: 1 1904.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:32123-2.
This name was in version 1 of The Plant List, record kew-21197, and has not been changed.