This name is a synonym of Magnolia acuminata var. subcordata (Spach) Dandy.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 117425) with original publication details: Torreya 31: 37 1931.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:149262-2.
This name was in version 1 of The Plant List, record kew-117425, and has not been changed.