This name is a synonym of Magnolia carsonii var. phaulanta (Dandy ex Noot.) S.Kim & Noot..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 117772) with original publication details: Blumea 32: 359 1987.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:933058-1.
This name was in version 1 of The Plant List, record kew-117772, and has not been changed.