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The present study aimed a floristic survey of aquatic macrophytes in four water supply reservoirs (Irai, Passauna, Piraquara I and II) of the Iguacu River basin, Parana, Brazil. Sampling and herborization of biological material followed methods described in literature. The species were classified by life forms. We found 90 species in 57 genera and 36 families, were 52.7% are monospecific. The richest reservoir was Passauna (40 spp.), followed by Irai, Piraquara I and Piraquara II (36 spp. each). Cyperaceae was the most representative with 17 spp., followed by Asteraceae, Onagraceae and Polygonaceae (7 spp. each). Amphibious and emergent life forms were equally express throughout species (41% each). Since aquatic macrophytes structure and contribute to environment biodiversity, the present study can assist management and implementation of biodiversity conservation efforts.

Floristic survey and species richness of aquatic macrophytes in water supply reservoirs