This name is a synonym of Begonia holtonis A.DC..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 362962) with original publication details: Bot. Jahrb. Syst. 74: 604 1949.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:30890-2.
This name was in version 1 of The Plant List, record kew-362962.