This name is a synonym of Adenostyles alliariae subsp. macrocephala ("Huter, Porta & Rigo") Wagenitz & I.Müll..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record F03520E9-DB31-4498-98FC-226A1A05A913) with original publication details: Fl. Italia 3: 205 (1903) 205 1903.
This name was in version 1 of The Plant List, record gcc-18620.