This name is a synonym of Achillea aleppica subsp. densa (Blakelock) Hub.-Mor..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 4DE37C2A-F822-4E4D-9E59-EB8B5D6265E7) with original publication details: 41 1949.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:173934-1.
This name was in version 1 of The Plant List, record gcc-136143, and has not been changed.