This name is a synonym of Begonia brachybotrys Merr. & L.M.Perry.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 361126) with original publication details: J. Arnold Arbor. 29: 160 1948.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:104309-1.
This name was in version 1 of The Plant List, record kew-361126, and has not been changed.