This name is a synonym of Magnolia mediocris (Dandy) Figlar.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 252971) with original publication details: Proc. Int. Symp. Magnoliac. 23 2000.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:20011719-1.
This name was in version 1 of The Plant List, record kew-252971.