This name is a synonym of Mentha longifolia subsp. polyadena (Briq.) Briq..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 125487) with original publication details: Bull. Trav. Soc. Bot. Genève 5: 84 1889.
This name was in version 1 of The Plant List, record kew-125487, and has not been changed.