Twenty seven extracts from eight medicinal plants used in Morelos, Mexico, for the treatment of several infectious diseases were screened for their in vitro anti-Mycobacterium tuberculosis (anti-MTB) activity on H37Rv strain of Mycobacterium tuberculosis (MTB), using the microplate Atamar assay test. Extracts (hexane, dichloromethane and methanol) from wild specimen of Valerians edulis showed the most significant (p