This study aimed to compare the flora of the vegetation formations that compose the Restinga ecosystem in the States of Rio de Janeiro and Espírito Santo, Brazil. The compile data about floristic and phytosociological was carried, using the Jaccard similarity index, in which the interpretations were given by the Unweighted Pair Group Method with Arithmetic Mean (UPGMA). 11 configurations analyzed totalize 990 species belonging to 141 families, being the richest families: "Fabaceae (73), Myrtaceae (59), Rubiaceae (48), Orchidaceae (44), Cyperaceae (38), Poaceae (36), Bromeliaceae (35), Euphorbiaceae (30), and Asteraceae (30)". The similarity among areas was low, with the highest value of 33%. The results reflected high floristic heterogeneity in the formations that compose the Restinga ecosystem in those states, and this heterogeneity caused by different factors that act on each plant communities (phytocenoses).
Sandy ecosystem; Vegetation formations; Floristic similarity
