This name is a synonym of Magnolia dodecapetala (Lam.) Govaerts.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 117776) with original publication details: Prodr. Veg. Ind. Occ. 87 1788.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:554805-1.
This name was in version 1 of The Plant List, record kew-117776, and has not been changed.