This name is a synonym of Centaurium erythraea subsp. grandiflorum (Pers.) Melderis.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Mem. Soc. Brot. 21: 236 1971.
This name was in version 1 of The Plant List, record kew-2708647, and has not been changed.