OICC Press Journal of Rangeland Science 2423-642X 15 4 2025 09 14 Ethnobotanical survey of medicinal plants in Delfan County, Lorestan Province, Iran 1 14 10.57647/j.jrs.2025.1504.38 EN Amir Mirzaei Mossiavand Faculty of Natural Resources, Lorestan University Farajollah Tarnian Faculty of Natural Resources, Lorestan University Azad Rastegar Kurdistan Agricultural and Natural Resources Research and Education Center, AREEO, Sanandaj, Iran Journal Article 2025 09 14 Ethnobotany investigates the traditional and local application of plants in different regions.  This study aimed to introduce the most important medicinal plants in Delfan County, Lorestan Province, Iran, and their applications in traditional therapies. The plant samples in the area were collected during the growing season based on the common methods of plant taxonomy using different flora and other sources. The medicinal species were identified using different flora and other references. The family, genus, species, and plant organs with medicinal value were determined. The protective classes of plants were investigated using the Red Data Book of Iran. Ethnopharmacological data were collected using various references, questionnaires, field survey methods, and group interviews. In total, 212 species were collected, of which 114 medicinal species belonging to 33 families and 95 genera were identified. The results showed that the largest families in terms of the number of medicinal species; Lamiaceae with 23 species (20.18%), Asteraceae with 20 species (17.54%), Fabaceae with 9 species (7.89%), Apiaceae with 7 species (6.14%), and Poaceae and Brassicaceae each with There are 6 species (5.26%). Biological forms of plants were determined based on Raunkiaer. Hemicryptophytes 44.70%, therophytes 30.70%, chaemophytes 11.40%, phanrophytes 7% and geophytes 6.10% of the plants of the region. Many species (about 34%) have Irano-Turanian region distribution. Iran's endemic species in the region include two types of protection class in Endangered (EN) with 2 species and Vulnerable (VU) with one species. Examining the therapeutic properties of medicinal plants in the studied area showed that they are anti-inflammatory (11%), diuretic (11%), anti-diabetic (10%), digestive (8%) antimicrobial (7%), analgesic (6%), sedative (6%), stomachic (6%), hepatoprotective (5%) and cough (5%) are the most used medicinal plants in the region.