This name is a synonym of Betula papyrifera var. cordifolia (Regel) Regel.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 21229) with original publication details: Novye Mem. Moskovsk. Obshch. Isp. Prir. 13: 86 1861.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:32238-2.
This name was in version 1 of The Plant List, record kew-21229, and has not been changed.