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 109101) with original publication details: Agron. Lusit. 24: 173 1964.
This name was in version 1 of The Plant List, record kew-109101, and has not been changed.