A floristic study in Bahar-ab Kuh area in Zagros mountains (in the border of Kermanshah and Ilam provinces, Iran)

This research is based on a floristic study in Bahar-ab Kuh area (Zagros mountains) in the border of Kermanshah and Ilam provinces, 128 plant species from 106 genera belonging to 38 families were identified. The richest families were Asteraceae with 17 species (13.28%), Fabaceae with 16 species (12.5%) and Poaceae with 15 species (11.70%), respectively. Euphorbia and Trifolium constituted the largest genera with 4 species. According to the life form spectrum, the highest proportion of life forms belonged to therophytes (46.93%), hemicryptophytes (25.76%), geophytes (11.71%), chamaephytes (8.59%) and phanerophytes (7.03%), respectively. Likewise, the highest proportion of chorotypes belonged to Irano-Turanian elements (53.90%), followed by Irano-Turanian/ Mediterranean (17.18%), Irano-Turanian/ Euro-Siberian (9.37%), Irano-Turanian/ Mediterranean/ Euro-Siberian (6.25%), Irano-Turanian/ Sahara-Sindian (5.46%), Irano-Turanian/ Euro- Siberian/ Sahara-Sindian (4.68%) and cosmopolitan elements (3.12%). Moreover, 5.46% of these plants were endemic for Iran.