This name is a synonym of Cota tinctoria subsp. gaudium-solis (Velen.) Oberpr. & Greuter.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 6A7EA038-6AB0-4CB4-B248-EC277BEBAFCD).
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 Anthemis gaudium-solis in version 1 of The Plant List.