This name is a synonym of Tanacetum argenteum subsp. flabellifolium (Boiss. & Heldr.) Grierson.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 51AAC1D9-5A35-4065-88F5-0D78CE514D2E) with original publication details: 27 1849.
This name was in version 1 of The Plant List, record gcc-7244, and has not been changed.