This name is a synonym of Begonia lacunosa Warb..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 362312) with original publication details: Bot. Jahrb. Syst. 81: 181 1961.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:105174-1.
This name was in version 1 of The Plant List, record kew-362312, and has not been changed.