This name is a synonym of Begonia chaetocarpa Kuntze.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 361241) with original publication details: Revista Univ. (Cuzco) 33(87): 76 1944.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:30457-2.
This name was in version 1 of The Plant List, record kew-361241, and has not been changed.