This name is a synonym of Begonia mangorensis Humbert.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 362273) with original publication details: Bull. Mus. Natl. Hist. Nat., Sér. 3, Bot. 3: 81 1972.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:874697-1.
This name was in version 1 of The Plant List, record kew-362273.