This name is a synonym of Begonia longipetiolata Gilg.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 362444) with original publication details: Bull. Jard. Bot. Natl. Belg. 39: 86 1969.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:105269-1.
This name was in version 1 of The Plant List, record kew-362444, and has not been changed.