Study of flora, Life form and Chorotypes of the Forest area of West Kurdistan (Iran)

Studies show that Iran has been considered as one of the centers of rich and unusual flora in the world. Based on the literature, the numbers of accounted plant species are mostly from 8000 to 8500 species. This study aims at the life form and Chorotype flora forest area in west of the province. In order to study the forest floor in the forests of Bane and Marivan, 120, 500 -square meter plots were randomly selected respectively. Results of the study showed 37 families, 151 genera and 178 species exist in the region. Families of Asteraceae with 32 species, Poaceae with 26 species, Apiaceae with 18 species, Fabaceae, with 18 species and Lamiaceae with 13 species can be found in the region. Hemicryptophytes with 52/2 % (93 species), therophytes with 23/5 % (42 species), geophytes with 15/6 % (27 species), chamaephytes with 5 % (9 species) and phanerophytes with 3/9 % (7 species). High percentage of hemicryptophytes marks the mountainous cold climate of the region. The geographical distribution of the plants showed that the 52/2 % species (93 species) belonging to the regions of Irano- Turanian, 2/12 % species (11 species) with a wide distribution (cosmopolitan) were most important ecological groups in the region .Other species are also found in other regions other than the IranoTuranian regions.