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 362391) with original publication details: Bol. Soc. Brot. II, 13: 111 1939.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:20011673-1.
This name was in version 1 of The Plant List, record kew-362391, and has not been changed.