University of Isfahan Journal of Plant Biological Sciences 3041-9603 4 11 2012 04 20 Study of flora, life forms and chorotypes of plant elements in pastural region of Yahya Abad (Natanz) Study of flora, life forms and chorotypes of plant elements in pastural region of Yahya Abad (Natanz) 1 12 18833 FA Shabnam Abbasi 1 Department of Biology, Faculty of Sciences, University of Isfahan, Isfahan, Iran Saeed Afsharzadeh 1 Department of Biology, Faculty of Sciences, University of Isfahan, Isfahan, Iran Abdolreza Mohajeri The Natural Resource and Watershed of Province of Isfahan, Isfahan, Iran Journal Article 2016 06 14 The Region of Yahya Abad is located at the Southern slops of Karkas mountains with about area of 6000 hectare, at 35 kilometres southwest of Natanz. The lowest altitude of this region is 2000 m and the highest altitude is 2720 m. The average annual precipitation is 147.22 mm and mean annual temperature is 15.41 C. The overall plants of the area constituted 190 species belonging to 31 families and 129 genera. A total of 18 genera (62%) and 23 species (12%) belonged to monocotyledons, 111 genera (86%) and 167 species (88%) to dicotyledons. The most families were Asteraceae (36 species), Poaceae (23 species), Fabaceae (19 species), Brassicaceae (18 species), Lamiaceae (17 species), Caryophyllaceae (12 species) and Rubiaceae (5 species). Study of chorology indicated that the most plants were the Irano-Turanian floral elements (71.1%) and Irano-Turan-Euro-Sieberian floral elements (14.4%), among which 35 species were endemic of Iran. In this research, hemicryptophytes (44.7%), therophytes (29%), chamaephytes (18.4%), geophytes (6.3%) and phanerophytes (1.6%) made up the most important life forms, respectively. The Region of Yahya Abad is located at the Southern slops of Karkas mountains with about area of 6000 hectare, at 35 kilometres southwest of Natanz. The lowest altitude of this region is 2000 m and the highest altitude is 2720 m. The average annual precipitation is 147.22 mm and mean annual temperature is 15.41 C. The overall plants of the area constituted 190 species belonging to 31 families and 129 genera. A total of 18 genera (62%) and 23 species (12%) belonged to monocotyledons, 111 genera (86%) and 167 species (88%) to dicotyledons. The most families were Asteraceae (36 species), Poaceae (23 species), Fabaceae (19 species), Brassicaceae (18 species), Lamiaceae (17 species), Caryophyllaceae (12 species) and Rubiaceae (5 species). Study of chorology indicated that the most plants were the Irano-Turanian floral elements (71.1%) and Irano-Turan-Euro-Sieberian floral elements (14.4%), among which 35 species were endemic of Iran. In this research, hemicryptophytes (44.7%), therophytes (29%), chamaephytes (18.4%), geophytes (6.3%) and phanerophytes (1.6%) made up the most important life forms, respectively. https://ijpb.ui.ac.ir/article_18833_3b76dc1fbed5b3cefeff56f24ff5d57e.pdf