This name is a synonym of Achillea micrantha Willd..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 3FDDF52F-4ADB-487C-8732-AB210A5BD6BE).
This name record (from TICA) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Achillea gerberi in version 1 of The Plant List.