This name is a synonym of Begonia dregei Otto & Dietr..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 362550) with original publication details: Bot. Jahrb. Syst. 81: 143 1961.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:105360-1.
This name was in version 1 of The Plant List, record kew-362550.