This name is a synonym of Achillea santolinoides subsp. wilhelmsii (K.Koch) Greuter.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record A2FF11C3-12F8-4AEB-B74E-B41FF18CC017) with original publication details: Bull. Soc. Bot. France 65 37 1918.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:174052-1.
This name was in version 1 of The Plant List, record gcc-111870.