This name is a synonym of Begonia polygonoides Hook.f..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 362829) with original publication details: Bull. Soc. Bot. France 58(8): 174 1911 publ. 1912.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:105575-1.
This name was in version 1 of The Plant List, record kew-362829, and has not been changed.