This name is a synonym of Begonia malmquistiana Irmsch..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 362266) with original publication details: Bot. Jahrb. Syst. 50: 339 1913.
This name was in version 1 of The Plant List, record kew-362266, and has not been changed.