This name is a synonym of Begonia seemanniana A.DC..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 361251) with original publication details: Smithsonian Misc. Collect. 69(12): 8 1919.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:30462-2.
This name was in version 1 of The Plant List, record kew-361251.