This name is a synonym of Begonia aconitifolia A.DC..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym and as an invalid name (record 362020) with original publication details: Begonias 352 1938.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:104968-1.
This name was in version 1 of The Plant List, record kew-362020, and has not been changed.