A floristic study of Kuh-e Khom in Tang Shekan region of Arsanjan county in Fars province

A floristic study was done in Kuh-e Khom in east of Arsanjan county as part of the southern Zagros in Fars province. Altitude of the region is ranged from 1740 to 3270 m above sea level. The flora of the region with an emphasis on identifying habitats and the effect of altitude on vegetation were studied and sampling was done from 2010 to 2012. Totally, 440 plant specimens of vascular plant were collected which were belonging to 50 families, 198 genera and 287 species. The angiosperm plants were dominant and from them the dicot plants with 37 families, 167 genera and 246 species had the most diversity. The monocots plants with 9 families, 27 genera and 37 species were the second diversely group in the region. Gymnosperms and Pteridophyte each with two species had the lowest number of species. In respect to species richness, Asteraceae (43 species) was the largest family and after that Breassicaceae (33 species), Poaceae (24 species), Fabaceae (24 species), Lamiaceae (22 species), Caryophyllaceae (19 species) and Boraginaceae (13 species) had the most species diversity. Half of species were therophyte and 68% of species were belonging to Irano-Turanian region.