This name is a synonym of Cornus sericea subsp. occidentalis (Torr. & A.Gray) Fosberg.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 47516) with original publication details: Kalmia 13: 5 1983.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:66193-2.
This name was in version 1 of The Plant List, record kew-47516.