This name is a synonym of Phagnalon rupestre (L.) DC..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record EEA08050-00D0-430E-8C7A-96B872545DBB).
This name record (from TICA) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Phagnalon rupestre in version 1 of The Plant List.