This name is a synonym of Begonia heracleifolia Cham. & Schltdl..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 460304) with original publication details: Begonian 13: 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 heracleifolia in version 1 of The Plant List.