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The objective of this study was to determine the biomass of dominant aquatic plants at Hashilan wetland in Kermanshah Province, western Iran. Systematic sampling was used by placing 454 square plots (1 x 1 m) on 15
transects laid out on the area. Canopy cover was estimated in each plot and converted to biomass. Calculations for all plots (454) showed that two species, Carex distans and Cladium mariscus, with 0.402 and 0.005 kg per
square meter, were the most and least notable species, respectively. The average plant biomass increased and dominant species changed when only plots containing the species were included in calculations. In this case,
Typha domingensis with 1.912 (S.E=0125) and Juncus articulatus with 0.614 (S.E=0.086) kg per square meter had the highset and lowest biomass respectively.