This name is a synonym of Nematanthus lanceolatus (Poir.) Chautems.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50261146) with original publication details: Encycl., Suppl. 4: 202 1816.
This name was in version 1 of The Plant List, record tro-50261146, and has not been changed.