The geomorphological and climatic aspects influence the environments mosaic existing in the northern region of Rio Grande do Sul, of which the coastal dunes stand out. The aim of this study was to carry out the floristic survey, by means of walks, and characterize the vegetation structure through the evaluation ofphytosociological parameters in 45 plots, in a portion of coastal dunes, Torres, RS. A number of 141 species were identified, 104 native and 37exotics, distributed in 54 families. The families Asteraceae and Poaceae presented the highest floristic richness. The species with the highest value of importance were Panicum racemosum (P. Beauv.) Spreng. and Panicum repens L. The high number of species found as well as the presence of endangered species indicates the importance of the area and the need to expand efforts for conservation, mainly because it is a buffer zone of the conservation unit Ilha dos Lobos Wild Life Refuge.