Zarivar region, with about 12,000 km2 area, is located in the west of Iran, neighboaring the Marivan city. This region has a rich floral diversity due to some ecological factors such as: the average annual precipitation (about 997 mm/year), influence of the mediteranean water masses and situation within zagros mountain. The purpose of this study was to introduce floristic list, life forms and chorology of species of zarivar region. plant specimens were collected during years 2014-2016. Totally, 590 plant species belonging to 355 genera and 81 families were determined. Among the studied plants, 472 dicots and 116 monocots and two pteridophytes were recognized. The largest family was Compositae with 46 genera and 72 species, and the largest genus was Trifolium (Papilionaceae) with 10 species. Hemicryptophytes were the dominant life form and comprised 40% of the flora. From chorological point of view, the largest proportion of the flora belonged to the Iran-Turanian elements (38%). Among the 590 species of flora this region 160 species are medicinal plants, 43 species endangered Plants and 50 species endemic in Iran
