This name is a synonym of Philadelphus lewisii var. intermedius (A. Nelson) S.Y. Hu.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50116721) with original publication details: Bot. Gaz. 42(1): 53–54 1906.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:192800-2.
This name was in version 1 of The Plant List, record tro-50116721.