In Brazil and the world the medicinal plants have been used widely for prophylactic and palliative treatments for some diseases, taking themselves in account the low indices of collateral effect observed in its consumers (BALBACH & BOARIM, 1993). The Poejo (Mentha pulegium) is a plant tripping, perennial, of the Mentha sort, family of the Lamiaceae, known popularly as: wild mint, grass of Is Loureno, poejinho, poejo-Real. Its essential oil I possessed characteristic odor, when extracted it is presented in the yellow color, of the 21 identified components (group of the oxigenados monoterpenos) the constituent of bigger concentration was pulegona (73.4%) (PEACE et al, 2001), this substance in pure state when used in high doses it can induce to the abortion (CENTENO et al, 1998).
In the antiquity this plant was very used as important condiment for the increase of the useful life of milk and its smoke can act as repellent natural of fleas (CENTENO et al, 1998). Currently the antrpicas actions have influenced negative the ecosystem, propitiating one high index of contamination of vegetables. The importance of the use of the micropropagation techniques, this in the reproduction of a great number of healthy species, free of patgenos and genetically uniforms. The micropropagation of medicinal species is justified for the increasing demand of the pharmaceutical industry for virus plants indexadas, free, with high fitossanitria and physiological quality and the capacity of synthesis of secondary metablitos potencializada, through the genetic improvement (RUBIN et al). The use of the multiplication in vitro provides to a great number of changes, being important the elaboration of a way that optimizes the regulation of the growth and morfognese of fabrics and agencies..