This name is a synonym of Plantago gentianoides subsp. griffithsii (Decne.) Rech.f..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Mitt. Thüring. Bot. Vereins 11: 67 1897.
This name record (from WCSP (in review)) 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 Plantago griffithsii in version 1 of The Plant List.