University of Isfahan Taxonomy and Biosystematics 3115-9001 12 45 2020 12 21 A Floristic Study of the Western Part of Oshtrankooh Region in Lorestan Province مطالعۀ فلوریستیک بخش غربی منطقۀ اشترانکوه، لرستان 71 112 25630 10.22108/tbj.2021.126441.1144 EN Mohammad Mehrnia Assistant Professor, Lorestan Agricultural and Natural Resources Research and Education Center, AREEO, Khorramabad, Iran Younes Asri Associate Professor, Division of Botany, Institude of forest and rangelands, AREEO Tehran, Iran 0000-0002-4566-1756 Zahra Hosseini Graduated (MSc.) of Plant Sciences, Lorestan University Journal Article 2020 12 16 Oshtorankooh protected area is located in the east of Lorestan. The aim of the present study was to investigate vegetation, biological forms, and geographical distribution pattern of plant species in the area. A total of 730 species of vascular plants belonging to 77 families and 382 plant genera were identified. Asteraceae (116 species), Fabaceae (81 species), Lamiaceae (74 species), Poaceae (63 species), Brassicaceae (56 species), Apiaceae (46 species), and Rosaceae (24 species) had the highest number of species and the largest share of species richness in the study area. Hemicryptophyt with 264 species (36.16%) and Therophyt with 251 (34.38 %) were the most frequent biological form of the area. The plant species of the Irano-Turanian region with 330 species (45.2%) had the highest distribution and the dominant species of the region. Of the total species identified in the Oshtrankooh protected area, 107 were Iranian Endemics. In order to preserve valuable species of this region, it is necessary to implement severe conservation plannings. https://tbj.ui.ac.ir/article_25630_2de3b820fd638e6c9e8ac84670b57226.pdf