عنوان مقاله [English]
Thuja orientalis is exclusive to mountain areas. It is seen in forests as wild types in Dezicola village, Mazandaran province. In other areas except for southern parts of country, it is seen as artificial planting and has been considered from ancient times. Nowadays, it is planted in 29 provinces in order to extend green areas. However, its long-lived stands are observed in several provinces. There are 44 long-lived stands of Thuja orientalis, of which 35 are registered and their information are recorded. The long-lived stands have been reported in 6 provinces, among which south Khorasan has the most frequency with 6 stands. The most aged biota, Esphad, is almost 900-1040 years old, found in south Khorasan.