SUMMARY
Garda de Sus community is situated in the superior basin of Arie? river and it comprises important areas with the endangered medicinal plant Arnica montana in its perimeter. In these species habitats, 161 species of vascular plants have been identified, of which the number of the ones with oligotrophic character dominates, followed by the mesotrophic ones. The productivity presents a positive correlation with mesotrophic species and a negative one with oligotrophic ones.