This name is a synonym of Lavandula pedunculata subsp. sampaiana (Rozeira) Franco.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 274021) with original publication details: Mem. Real Soc. Esp. Hist. Nat. 2: 71 1904.
This name was in version 1 of The Plant List, record kew-274021, and has not been changed.