A study of flora in rangelands of Gheissari Koohrang region in Chaharmahal and Bakhtiari province

Assessing the floristic resources of each region is very important because it serves to identify it’s the genetic potential. The purpose of this study was to introduce floristic list, life forms and endangered species of Gheissari region. This region covers about 9816 ha and lies in the west part of Chaharmahal & Bakhtiari province. Field data were collected in the years between 2009 and 2010. During that period, the plant species were collected and then identified based on families, genera and species using appropriate reference. The results showed that there were 487 plant species belonging to 65 families and 301 genera. The families like Composite, Gramineae, Papilionaceae, Labiatae, Cruciferae, Umbeliferae and Caryophyllaceae had 70, 46, 41 39, 38, 30 and 21 species, respectively. These families made up 58.52 percent of the total species. According to Raunkiaer’s life form, species were as below: 50.31% hemicryptophytes (245 species), 23.20% therophytes (113 species), 12.52% cryptophytes (61 species), 7.60% phanerophytes (37 species) and 5.75% chamephytes (28 species). The chorology of species showed that 67.15 percent of species belonged to Iran-Turanian, 5.75 percent Polyregional, 2.67 percent Cosmopolitan and the rest belonged to the others. Threatened species included 86 species of the total species from Iran-Turanian. Among them, the endangered class, vulnerable, lower risk and data deficient were 2, 3, 67 and 14 species respectively.