This name is a synonym of Phalacrachena calva (Ledeb.) Iljin.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record CD09314A-44EF-4A3C-8122-FA6F21BFC083).
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 Centaurea calva in version 1 of The Plant List.