Veratrum lobelianum is a mountain species occurring mainly in the subalpine and montane zone in European and Asian mountains. In Poland, the species has lowlands localities. Three populations of the species were characterized in the Tarnów Plateau (Sandomierz Basin, southern Poland), growing in oak-hornbeam forest and alder carrs. In the similar climatic conditions but varied light and soil conditions (humidity) the species populations differed in morphological traits as plant height, leaves number, leave dimensions, and inflorescence length. The results extend the published ranges of the traits of the species.