Introduction to the flora, life form and plant geographical distribution in Ivar watershed

This research attempts to introduce a regional floristic list of Iivar, north of Khorasan province. Plants were collected by field survey and identified whit help of taxonomy resources. Also, use of native plant species and the palatibility amount for region animal of people asking found. The results showed that 109 plant species belonging to 24 families are habituated in the area. Asteracea was the largest plant families in terms of number of species (21 species) followed by Poaceae (15 species), Lamiaceae (10 species), Caryophyllaceae and Brassicaceae (6 species). 23 species with value of forage use had the highest value in terms of use according the account devoted by users.Based on the stability or longevity, 33 annual species, 4 biennial species and 72 perennial species were identified in the region. 71 species whit growing form of broad leaf showed the highest growing form of watershed. 95 species based on the palatability terms belonged to the rangeland class III, while 14 species had low values of the range class II. Hemicryptophytes (53 species), therophytes (26 species) and chamaephytes (13 species) were the most biological form. Furthermore, Irano-turanian (79 species), Irano-turanian, Sahar-sandy (9 species) and Irano-Turanian and Mediterranean (8 species) in the region had the greatest geographical distribution. Based on the results, non-palatability species due to high pressure on the region have distributed in the study area and, therefore, management efforts should be made to prevent this process from being exposed to a variety of plant.