This name is a synonym of Phoradendron californicum Nutt..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 19100415) with original publication details: Phoradendron 21, f. 13 1916.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:193922-2.
This name was in version 1 of The Plant List, record tro-19100415.