This name is a synonym of Begonia mannii Hook.f..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 362427) with original publication details: Veg. Erde 9(III 2): 619 1921.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:105256-1.
This name was in version 1 of The Plant List, record kew-362427, and has not been changed.