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The central part of Sefid- Kuh protected area covers an area of 10000 hectares situated in 480 2'-480 8' longitude and 330 40'-330 42' latitude. The vegetation of Se:fid-Kuh protlected area was studied, using the Braun¬Blanquet (Zygmatist) School. Based on the analysis of Phytosociological data and by using FCA and I-IAC methods, 18 associations and 6 subassociations were recognized" The following associations constitute the major part of the area: Quercetum persicae, Amygdaletum orientalis, Polygono luzuloidis-Astragaletunl trictifolii, Lonicero nummulariifoliae¬Amygdaletum orientalis, Phlom'ido olivieri-Ferulaginetum angulatae,
Astragalo microphysae-Acantholimentum aspadani, A s traga 10
nervistipuli-Daphnetum mucronatae. The steppe- forest associations belong to the class of Qurcetea persicae and the order of Quercetalia
persicae. The distribution of plant associations in the protected areas is mainly affected by topographic features, including altitude, slope and exposure as well as edaphic factors, such as soil depth and texture. In general, these factors operate in the establishment of plant communities in the different elevation zones and slopes.