This name is a synonym of Begonia angustiloba 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 361412) with original publication details: Prodr. 15(1): 307 1864.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:104536-1.
This name was in version 1 of The Plant List, record kew-361412, and has not been changed.