This name is a synonym of Carduncellus caeruleus C.Presl.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 016E04A2-0752-4603-9817-5853799ABDD1).
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 Carduncellus coeruleus in version 1 of The Plant List.