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 109104) with original publication details: Brotéria, Ci. Nat. 18: 70 1949.
This name was in version 1 of The Plant List, record kew-109104, and has not been changed.