This paper aims to present an overview of Spartina versicolor Fabre populations in the coastal
areas of Tuscany (Italy), in relation to its ecology and phytosociology. Geobotanical surveys were carried out on the
sedimentary coasts along the whole region. Data show that the species grows in embryo dunes, retrodunal sandy
lowlands and surrounding wet areas that are moderately saline. In all cases observed, the species exhibited also a
high sterility and clonal spread. Phytosociological data show different associative behaviours of S. versicolor in
different environment types. In particular it is possible to identify three different phytocoenoses strictly related to the
environmental typologies (dunal, interdunal/retrodunal or wet) and also to soil salinity. In addition, the observations
led us to describe a new subassociation
