A short survey on the flora of Siahlan mountain (Ghazvin- Iran)

Siahlan mountainous region an arduous heights is situated in the central Alborz Mountains، between 36ْ 28’ and 36ْ 45’ northern latitudes and 50ْ 38’ and 50ْ 60’ eastern longitudes، with an altitude rang from 2140 to 4175 m، in Rudbar Alamut region on east-north of Ghazvin province and bounded to the north by Mazandaran province in Tonekabun and on the east by Taleghan mountain. Plants were collected by common methods in floristic studies and were identifird using indispensable references. In this survey a total of 245 species has been identified from Siahlan region which belong to 42 families and 186 genera. The largest families in the region are Asteraceae (42 species)، Fabaceae (29 species)، Lamiaceae (24 species)، Poaceae (21 species)، Apiaceae (20 species)، Brassicaceae (19 species). The life form of plant species were determined by using of Ranunkiaerۥs method that including: 5% Phanerophytes، 2%Geophytes، 72% Hemicryptophytes، 2% Chamaephytes and 14% Therophytes، 4%Hemicryptophytes- helophyte، 1%Therophytes- helophyte and one species Geophytes- Hemicryptophytes. This area is geographically located in Irano-Turanian region. A considerable number of species (147 species) belongs to Irano-Turanian region. The Irano-Turanian/Euro-Siberian species with (68)، Irano-Turanian/ Saharo-Sindian (1)، Irano-Turanian/Euro-Siberian/Saharo-Sindian/species (13)، poly-regional (16 species) were phytogeographic elements of the region. From 245 identified species، the number of medicinal، endemic and helophyte species were 50، 39 and 13 respectively. Also a new species was recognized in the region.