This name is a synonym of Phagnalon rupestre subsp. illyricum (H.Lindb.) Ginzb..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 1C018A1A-1501-4BD0-9B0B-EC72A8E29592) with original publication details: Bonnier. 1922. 71 1922.
This name was in version 1 of The Plant List, record gcc-70226.