This name is a synonym of Achillea ageratifolia (Sibth. & Sm.) Benth. & Hook.f..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 56217B12-3074-4F60-82EF-F3D36BB213E9) with original publication details: 9 1974.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:876352-1.
This name was in version 1 of The Plant List, record gcc-139939.