SUMMARY
Habitats with endangered medicinal species Arnica montana are spread on both geomorphological units of Gda de Sus community, also on siliceous substratum as well as on limestone substratum. Species of vascular plants have been studied under qualitative and quantitative aspects. These species make obvious their oligotrophic character for both regions, but ones on siliceous substratum show a more pronounced and more restructiv oligotrophic character than the ones from northern region, mostly limestone. In both regions this character is not an extreme oligotrophic one, the Arnica montana species developing sometimes better along mezotrophic species on grasslands fertilized in traditional system in relatively small quantitives of stable manure.