This name is a synonym of Begonia carpinifolia Liebm..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 460280) with original publication details: Begonian 8: 122, 241 1946.
This name record (from WCSP) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Begonia carpinifolia in version 1 of The Plant List.