This name is a synonym of Begonia buimontana Yamam..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 361571) with original publication details: Col. Ill. Fl. Taiwan 3: 618 1988.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:936419-1.
This name was in version 1 of The Plant List, record kew-361571, and has not been changed.