Abstract The chemical composition of the essential oils obtained from three different Lamiaceae, Lepechinia graveolens, L. floribunda and L. meyeni growing in the High Valley Region of Bolivia, Province of Cochabamba, was determined by a combination of GC and GC/MS measurements. Sesquiterpenes dominated in L. graveolens (61%). In the oil of L. meyeni the monoterpenes constituted the most important fraction (ca. 40%) followed by oxygenated sesquiterpenes (ca. 31%). Finally, the composition of the oil of L. floribunda was more complex: sesquiterpenes (20â28%), monoterpenes (21â20%), oxygenated sesquiterpenes (21â23%), and oxygenated monoterpenes (18.5â13%).