This name is a synonym of Cestrum elegans (Brongn. ex Neumann) Schltdl..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 29602113) with original publication details: Ann. Fl. Pomone 118 1844.
This name was in version 1 of The Plant List, record tro-29602113, and has not been changed.