Аннотация:Montenegro belongs to the Mediterranean climate zone, but due to the presence of high mountain ranges on a fairly limited territory, there is a multitude of microclimatic varieties: in the coastal part there is a zone of pronounced Mediterranean climate; in the flatland part of the country the climate is a changed Mediterranean; in mountainous areas - a zone of severe mountain climate with cold long winters. In the diversity of the flora of this region, an important place is occupied by the Black Pine ( Pinus nigra ), which grows both in the mountainous parts and in the valleys and, according to some versions, gave the country its name. It is of interest to analyze the variability of the morphometric parameters of this plant species depending on the growing conditions. This study is based on the establishment of a field practice in biogeography in the summer of 2021, held in Montenegro. The aim of the work was to determine the dependence of modification changes in Black Pine on the height of growth above sea level according to the following indicators: tree height, crown diameter, trunk diameter, and needle length.