The area of the Vikos –Aoos National Park is characterized by rich floristic diversity. Recent studies show that in Tymfi mountain alone occur more than 1,750 plant species and subspecies, while systematic records are showing that the region is one of the most important areas of the Greek and Balkan flora. A quarter of the 202 recorded genera (taxa) are identified as highly important because of endemism. Five of these are found exclusively in this area, while others are endemic in Greece or Balkans and are limited distributed in Greece, protected by national or international laws or directives.