This name is a synonym of Begonia micranthera Griseb..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 362351) with original publication details: Darwiniana 5: 97 1941.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:30755-2.
This name was in version 1 of The Plant List, record kew-362351.