This name is a synonym of Achillea millefolium subsp. sudetica (Opiz) Oborny.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 8D699314-E982-441C-B433-99F0F466F021) with original publication details: Murr. 1924. 319 1924.
This name was in version 1 of The Plant List, record gcc-59868, and has not been changed.