Synonyms: Carduus praticola; Centaurea bracteata (heterotypic); Centaurea brevipappa; Centaurea denticulata; Centaurea dubia f. hedraeantha; Centaurea dubia f. microchaetes; Centaurea dubia f. praticola; Centaurea dubia nigrescens; Centaurea jacea nigrescens; Centaurea jacea var. nigrescens; Centaurea kochii (homotypic); Centaurea nigrescens var. monocephala; Centaurea nigrescens var. vulgaris; Centaurea schemnitzensis (homotypic); Centaurea sciaphila; Centaurea subcordata; Centaurea trapezuntina; Centaurea tubulosa (homotypic); Cyanus nigrescens; Jacea brevipappa; Jacea nigrescens; Jacea subcordata (homotypic); Phrygia pratensis; Setachna nigrescens