This name is a synonym of Magnolia virginiana L..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 454321) with original publication details: Hort. Kew. 2: 251 1789.
This name record (from WCSP) 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 virginiana in version 1 of The Plant List.