The meiotic behavior and somatic chromosomic number of 4 populations belonging to Minthostachys mollis (Kunth.) Griseb. species were determined. This is the first study on these aspects not only for this species but also for the entire Minthostachys genus. The most frequent meiotic irregularities observed were univalents, laggards and triads; whereas cytomixis and bridges were observed only in 2 populations. Besides the occurrence of triads, the presence of hexads and dyads were also seen. With respect to the somatic chromosomic number, this study reveals the presence of 2n=42 chromosomes for the P₁, P₂ and P₃ populations and 2n=24 chromosomes for the P₄ population.