This name is a synonym of Lavandula pedunculata subsp. atlantica (Braun-Blanq.) Romo.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 109095) with original publication details: Bull. Soc. Hist. Nat. Afrique N. 13: 191 1922.
This name was in version 1 of The Plant List, record kew-109095, and has not been changed.