This name is a synonym of Lavandula pedunculata subsp. lusitanica (Chaytor) Franco.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 274020) with original publication details: Lab. Alp. Mar. 463 1895.
This name was in version 1 of The Plant List, record kew-274020, and has not been changed.