Floristic studies,life forms and chorotype of plants in the transitional zone of Irano-Turanian and Sahara-Sindian phytochoria in Sistan and Baluchestan Province. Iran

Floristic studies of any regions have high importance, because the florists list is an exploration document to identify the existing species and consequently the potential of the area. The aim of the study was introducing the flora of the transitional zone of Irano-Turanian and Sahara-Sindian phytochoria in Sistan and Baluchestan Province. For a floristic study of the area plant specimens were collected and identified.Field data collections were conducted during the year 2013. The life forms as well as geographical distributions of the species were determined. Flora in this region include 51 families, 233 genera and 327 species. The larger families are Compositae (42 species), Poaceae (39 species), Brassicaceae (28 species), Papilionaceae (27 species) and Chenopodiaceae (25 species) respectivly. The biggest genus was Astragalus with 7 species. Biological types of this area included Therophytes (37.92%) where the dominant life-form followed by hemicryptophytes (22.94%). phanerophytes (18.96%), Chamaephytes (14.37%) and Geophytes (5.81%). Chrological analysis showed 24.77% of the studied plant species belonged to Irano-Turanian / Sahara-Sindian region and 24.16% Sahara-Sindian, 22.33% Irano-Turanian, 3.36% cosmopolitan elements and others are ploriregional. According to the results of this study, it can be concluded that the research area is located in Ecoton region.