This name is a synonym of Achillea nana L..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record D8868747-88FC-4C1A-A332-B7C2B8D42262).
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 nana in version 1 of The Plant List.