Background and purpose: The genus Phlomis and Stachys (Labiatae) are widely distributed in Iran. There are no reports on the antimicrobial activity of some of these plants. The medicinal properties attributed to the genus Phlomis and Stachys prompted us to investigate the antimicrobial activity of the methanolic extracts of Phlomis bruguieri, P. herba-venti, P. olivieri, Stachys byzantina, S....