This name is a synonym of Phoradendron leucarpum subsp. tomentosum (DC.) J.R. Abbott & R.L. Thompson.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 19100433) with original publication details: Mem. Amer. Acad. Arts, n.s. 4(1): 59 1849.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:1110826-2.
This name was in version 1 of The Plant List, record tro-19100433.