This name is a synonym of Graellsia hederifolia subsp. cossonii (O.E.Schulz) R.D.Hyam & Jury.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Pflanzenr. IV, 105(89): 147 1927.
This name was in version 1 of The Plant List, record kew-2776486, and has not been changed.