This name is a synonym of Magnolia fistulosa (Finet & Gagnep.) Dandy.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 117859) with original publication details: J. Bot. 68: 208 1930.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:554859-1.
This name was in version 1 of The Plant List, record kew-117859.