This name is a synonym of Begonia cowellii Nash.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 361493) with original publication details: Contr. Gray Herb. 154: 23 1945.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:30522-2.
This name was in version 1 of The Plant List, record kew-361493, and has not been changed.