This name is a synonym of Begonia longifolia Blume.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 363256) with original publication details: J. Straits Branch Roy. Asiat. Soc. 75: 35 1917.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:105898-1.
This name was in version 1 of The Plant List, record kew-363256, and has not been changed.