This name is a synonym of Nematanthus fissus (Vell.) L.E. Skog.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50261094) with original publication details: Fl. Flumin. 257 1825.
This name was in version 1 of The Plant List, record tro-50261094, and has not been changed.