This name is a synonym of Schinus longifolia var. paraguariensis (Hassl.) F.A. Barkley.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 1300775) with original publication details: Brittonia 5: 166 1944.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:229211-2.
This name was in version 1 of The Plant List, record tro-1300775, and has not been changed.