This name is a synonym of Begonia hilariana A.DC..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 362800) with original publication details: Arch. Jard. Bot. Rio de Janeiro 8: 232 1948.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:30863-2.
This name was in version 1 of The Plant List, record kew-362800, and has not been changed.