This name is a synonym of Begonia per-dusenii Brade.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 362970) with original publication details: Bot. Jahrb. Syst. 78: 186 1959.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:30891-2.
This name was in version 1 of The Plant List, record kew-362970, and has not been changed.