Comparison of flora at the edge and within Oak forests in southern slopes of Kermanshah forests

in Southern slopes of Kermanshah forests. Three patches of oak forests stretched over the southern aspects of oak forests were selected with similar conditions of slope and altitude. Vegetation sampling in each patch was conducted at 0, 25, 50, 100 and 150 meter by using of 3 transects located in the 200m distances. The results show that in the study area there are 115 plant species which belong to 91genera and 25 families. The results show that in this area there are 115 plant species which belong to 91genera and 25 families: The Asteraceae and Fabaceae families (20 species, 17.39%) is the richest families and 9 families such as Fagaceae and Podophyllaceae (1 species, 0.87%) include the least of plant species in region. Most plants in the area belong to Therophytes based on Rankaier’s life forms with (69 species, 60%) and phytogeographically belong to the Iranians Turanian area (74 species, 64.35%). 15 species (13.04%) were only observed at the edges and 5 species(4.35%) were just recorded within forest.