This name is a synonym of Philadelphus microphyllus var. crinitus (C.L. Hitchc.) B.L. Turner.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50107074) with original publication details: Madroño 7(2): 45, f. 1 [map] 1943.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:192828-2.
This name was in version 1 of The Plant List, record tro-50107074.