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 361655) with original publication details: Bol. Mus. Nac. Rio de Janeiro, Bot. 1: 12 1944.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:30572-2.
This name was in version 1 of The Plant List, record kew-361655.