This name is a synonym of Phoradendron serotinum var. pubescens (Engelm. ex A. Gray) M.C. Johnst..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50065081) with original publication details: Boston J. Nat. Hist. 6(2): 212 1850.
This name was in version 1 of The Plant List, record tro-50065081.