547.972Ballota L. is a plant belonging to the Lamiaceae family and is represented by 16 taxa in Turkey [1]. Ballota species have been used in Turkish folk medicine as an antiulcer, antispasmodic, diuretic, choleretic, antihaemorrhoidal, and sedative agents [2,3]. The antimicrobial activities [4] and the antioxidant activities [5] of all Ballota species growing in Turkey was recently reported as well as the antifungal activities of some flavonoids isolated from B. glandulossima [6] and B. inaequidens [7]. The water extract of B. glandulosissima has been reported to have antinociceptive [8], antiinflammatory, and hepatoprotective activities [9].Previous investigations of the aerial parts of the Ballota species resulted in the isolation of some flavonoids apigenin and apigenin-7-glucoside [10,11]; kumatakenin, ladanein [10]; genkwanin, nuchensin, isokaempferide, luteolin, luteolin-7-rutinoside, quercetin-3-glycoside, salvigenin, apigenin 6,8-di-C-glycoside [10]; luteolin-7-glycoside [10]; scutallerein-7,4′-dimethylether, acacetin-7-glycoside, chrysoeriol-7-glycoside [10], luteolin-7-lactate, and luteolin-7-glycosyl lactate [12].In our previous studies, three diterpenoids (hispanolone, ballonigrine, dehydrohispanolone) and ten flavonoids (kumatakenin, pachypodol, 5-hydroxy-7,3′,4′-trimethoxyflavone, velutin, corymbosine, 5-hydroxy-3,7,4′-trimethoxyflavone, retusin, 5-hydroxy-7,4′-dimethoxyflavone, 5-hydroxy-3,6,7,4′-tetramethoxyflavone, ladanein) were isolated, chemically characterized, and analyzed by HPLC in different species of Ballota [6,7,13,14].Thus, as a continuation of our research [3-9, 13-15] on this genus we now report on the flavonoids present in the acetone extracts from sixteen species of the genus Ballota. Our aim is to contribute to their chemotaxonomic determination and establish the flavonoid profiles of Ballota species. To our knowledge, no data are available with respect to the chemotaxonomic determination and HPLC analysis of this genus.