International Science Community Association Research Journal of Recent Sciences 2277 - 2502 4 1 2015 January 2 A preliminary checklist of vascular aquatic plants of Iran 1 8 EN Mehdi Yousefi 1 Department of Biology, Payam Noor University, Tehran, IRAN Sanaz Toranj 2 > Research Paper 2013 6 2 2015 January 2 A first checklist of vascular aquatic macrophytes of Iran is presented with data on their life forms, distributions, and the frequency of their occurrence in geographical parts of the country, via a complete literature survey as well as herbarium speciemens examination and field observations. As the results, there are about 284 species of vascular aquatic and semi-aquatic macrophytes belonging to 127 genera and 57 families in Iran among them 80.3% of the species are helophytes, 13.9% submerged, 3.5% floating leaved and 2.3% free floating. Twenty seven of the families are also true hydrophytes families. Distributional points of view, the highest number of the aquatic species is found in the north and the lowest amount of them is found in the east of the country. Copyright@ International Science Community Association