This name is a synonym of Begonia annobonensis A.DC..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 362784) with original publication details: Bol. Soc. Brot. 10: 122 1892.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:105537-1.
This name was in version 1 of The Plant List, record kew-362784, and has not been changed.