This name is a synonym of Begonia nigritarum Steud..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 362837) with original publication details: Ann. Sci. Nat., Bot. IV, 11: 129 1859.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:105582-1.
This name was in version 1 of The Plant List, record kew-362837.