This name is a synonym of Ammi majus subsp. procerum (Lowe) Menezes.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Man. Fl. Madeira 1: 351 1864.
This name was in version 1 of The Plant List, record kew-2633884, and has not been changed.