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 117428) with original publication details: Bot. Gaz. 87: 232 1919.
This name was in version 1 of The Plant List, record kew-117428, and has not been changed.