This name is a synonym of Begonia rex Putz..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 362164) with original publication details: Acta Phytotax. Sin. 33: 271 1995.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:984319-1.
This name was in version 1 of The Plant List, record kew-362164.