This name is a synonym of Phoradendron argentinum Urb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50128016) with original publication details: Phoradendron 121, f. 178 1916.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:194143-2.
This name was in version 1 of The Plant List, record tro-50128016, and has not been changed.