This name is a synonym of Nematanthus fornix (Vell.) Chautems.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50261110) with original publication details: Fl. Flumin. 259 1829.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:281722-2.
This name was in version 1 of The Plant List, record tro-50261110, and has not been changed.