This name is a synonym of Magnolia sellowiana (A.St.-Hil.) Govaerts.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 373460) with original publication details: Cat. Pl. Exot. 8: 10 1853.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:77093656-1.
This name was in version 1 of The Plant List, record kew-373460, and has not been changed.