احمد قهرمان - Central Herbarium, Dept. of Botany, Faculty of Biology, College of Science, Univ. of Tehran, Tehran, Iran
علیرضا نقی نژاد - Central Herbarium, Dept. of Botany, Faculty of Biology, College of Science, Univ. of Tehran, Tehran, Iran E-mail: naqinezhad@khayam.ut.ac.ir
فریده عطار - Central Herbarium, Dept. of Botany, Faculty of Biology, College of Science, Univ. of Tehran, Tehran, Iran
بهنام حمزه ای - Dept. of Botany, Research Institute of Forests & Rangelands, Tehran, Iran
مصطفی اسدی - Dept. of Botany, Research Institute of Forests & Rangelands, Tehran, Iran

The Caspian (Hyrcanian) lowland forest zone in northern Iran is characterized by small remnant alder forest communities, dominated or subdominated with an Euxino-Hyrcanian element, Alnus glutinosa ssp. barbata. The first floristic inventory of these alder forests in northern Iran is presented. The floristic catalogue is based on the data of ۱۳۳ phytosociological releves in eight different alder forest sites and on a supplementary floristic inventory of the same sites. Totally, ۲۰۹ taxa were determined out of which ۲۵ taxa are endemic of Hyrcanian district. Classification based on life form, indicates that the geophytes and phanerophytes make up the largest proportion of the plants in the  studied  flora.

Caspian lowlands, Alnus glutinosa ssp. barbata, Black alder, Flora, chorology, life form, Similarity Index