Mehdi Aliabadi - Department Biology, Faculty of Science, University of Tehran
Ahmad Ghahreman, - Department Biology, Faculty of Science, University of Tehran
Musa Iranshahr, - Department Biology, Faculty of Science, University of Tehran
Farideh Attar - Department Biology, Faculty of Science, University of Tehran

Recognition of vegetation & introduction of endemic species of one region, is the first step, for introducing abundant medical, nutritional & fodder potentials &applying the necessary management on Biodiversity preserving of the region. Thus in this study ,the life form,chorology, altitude & collect date of the endemic plants were determined. The study of chorology indicated that the most plants belonged to the Irano-Turanian region. Totally 16 endemic plants from 50 families among 300 spp., were recognized in Central Herbarium of Tehran University. The result show that the most important families, from the view of having endemic plants, are Asteraceae (4 spp.), Brassicaceae (2 spp.), Lamiaceae (2 spp.), Scrophulariaceae (2 spp.), Apiaceae (2 spp.), Boraginaceae (1 sp.), Capparidaceae (1 sp.), Crassulaceae (1 sp.) & Fabaceae (1 sp.). Life forms of endemics include Hemichryptophyes (3 spp.), Therophytes (3 spp.), Chamaephytes (5 spp.), Nanophanerophytes (1 sp.). Among 300 recognized species of this region, the high frequency of Therophytes (48%), Hemichryptophyes (16.3%) & Chamaephytes (14.3%), can be attributed to warm, dry & semi-desertic climate & vastness of growing agricultural lands. Thus more important than ever of conservation of vegetations of this region, for export scopes & gross domestic product, must be considered by relevant authorities & local people

Endemic, Life form, South Khorasan