Centaurea concolor (DC.) A. W. Hill, Index Kew., Suppl. 7: 44. 1929 Centaurea concolor (DC.) A. W. Hill, Index Kew., Suppl. 7: 44. 1929is new combination for Centaurea alba var. concolor DC., Prodr. 6: 569. 1838Taxon for this nameCentaurea concolor (DC.) A. W. Hill, Index Kew., Suppl. 7: 44. 1929