This name is a synonym of Achillea millefolium subsp. ceretanica (Sennen) Sennen.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record CE8B9F0C-182A-4403-9A27-8E12DEC1D797) with original publication details: 31 1862.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:174119-1.
This name was in version 1 of The Plant List, record gcc-94892.