This name is a synonym of Magnolia chapensis (Dandy) Sima.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 252933) with original publication details: Proc. Int. Symp. Magnoliac. 22 2000.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:20011698-1.
This name was in version 1 of The Plant List, record kew-252933, and has not been changed.