This name is a synonym of Micromeria filiformis subsp. cordata (Moris) Pignatti.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 127155) with original publication details: Stirp. Sard. Elench. 2 1827.
This name was in version 1 of The Plant List, record kew-127155, and has not been changed.