Cyperus-dominated vegetation in the eastern Po river

The ephemeral vegetation dominated by Cyperus sp. pl. was surveyed and analyzed along the eastern trait of the Po River (Po Plain, Italy). Two formerly described communities were recognized: Cyperetum esculenti and Amaranthus tuberculatus -phytocoenon. A third greater cluster is assigned to a new association: Cyperetum micheliano-glomerati . It is characterized by Cyperus glomeratus , C. michelianus , C. odoratus and C. squarrosus , that have been detected on over 75 % of the relevés. The main floristic and ecological traits of these detected vegetation types are discussed.