This name is a synonym of Begonia radicans Vell..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 362729) with original publication details: Fl. Flumin. 10: t. 36 1831.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:105492-1.
This name was in version 1 of The Plant List, record kew-362729.