This name is a synonym of Magnolia acuminata (L.) L..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50235293) with original publication details: Prodr. 1: 80 1824.
This name record (from Tropicos) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Magnolia acuminata in version 1 of The Plant List.