Diversity of Plant Species in Evin-Darakeh Mountainous Region

Evin-Darakeh Mountain region is situated in the northeastern part of Tehran. The area is located at 51 23' north longitude and 35 48’ to 35 54' east latitude. This region is as a part of mountain area of central Alborz confined to eastern the hills of Aliabad of Velenjak, westward to highest of east Hessarak, northward Touchal and heights of Shahneshin, southward Evin region. The annual rainfall is 300-400 mm and the mean annual temperature is 16/7 C. The present survey was carried out to introduce the flora, identify the biotypes and determine the phytogeographical dispersal of plant species existing in the said region. The results of this survey indicate that 296 species out of 214 genera belong to 56 plant families are exist: Compositae with 47 species, Papilionaceae with 32 species, Cruciferae with 30 species, Graminae with 30 species, Labiatae with 17 species comprise the highest number of species. From viewpoint of biotypes Hemicryptophytes 44. 3% Therophytes 38% Chamephytes 10. 5% cryptophytes 4. 4% Phanerophytes2. 8% are, from viewpoint of chorological elements Irano-Turanian elements are 51. 9% Irano-Turanianm-Mediterranean Viewpoint are 14% Cosmopolitan elements are 10. 5% and others species are belong to the other regions. From the said numbers, 21 (%7. 1) species are endemic species.