This name is a synonym of Achillea ageratifolia subsp. aizoon (Griseb.) Heimerl.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 1D8FBA9A-98A5-4802-BD99-25468D33EABC) with original publication details: Bot. Mag. 100 1874.
This name was in version 1 of The Plant List, record gcc-20172.