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 29602122) with original publication details: Candollea 6: 124 1935.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:815833-1.
This name was in version 1 of The Plant List, record tro-29602122, and has not been changed.