This name is a synonym of Begonia pastoensis A.DC..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 362568) with original publication details: Fieldiana, Bot. 28: 418 1952.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:30809-2.
This name was in version 1 of The Plant List, record kew-362568.