A study of the flora of aquatic habitats in East and West of Mazandaran province, Iran

To judge and to evaluate the ecological characteristics of a region، vegetation is of prime importance. In fact، it reflects the biological reactions against the environmental conditions، plant evolution process and geographical condition of the past. The purpose of this study was to collect and identify aquatic plants of the East and the West of Mazandaran province. Therefore، sampling sites viz. stagnant water stops and irrigated farms were selected، marked out on the map and the specimens were collected. The collected plants were identified using different references in the Herbarium of Nowshahr Botanical Garden as well as Herbarium of Research Institute of Plant Science، Ferdowsi University of Mashhad. In this survey، a total of 126 aquatic plant species، belonging to 44 families were recognized. Among them، 56 species of Dicotyledones، 63 species of Monocotyledones، 4 species of Pteridophytes، 1 species of algae and 2 species of bryophytes were reported. Chorological studies showed that most of the species belonged to the Euro-Siberian، Mediterranean، Irano-Turanian (triregional) and the rest to Pluriregional and Cosmopolitan phytochoria.