This name is a synonym of Nepeta nepetella subsp. murcica (Guirão ex Willk.) Aedo.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 460516) with original publication details: Exsicc. (Fl. Hisp.) 7: no. 677 1951.
This name record (from WCSP) 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 Nepeta nepetella in version 1 of The Plant List.