Floristic of the ecosystems of Campus Carreiros, Rio Grande, Rio Grande do Sul, Brazil

The Campus Carreiros of the Rio Grande Federal University is an area of 227 hectares and vegetation is distributed in natural and anthropized ecosystems. We conducted a survey of vegetation taking into account the classification of the species as their origin and their distribution in different ecosystems found on this Campus. The flora was composed of 392 species distributed in 286 genera and 101 families. Families with the highest number of species were Asteraceae, Poaceae, Fabaceae and Cyperaceae. The predominant life form was herbaceous presenting a relationship with the field which was the area's prevailing ecosystems. Concerning the origin, 266 (68%) native and 126 (32%) exotic species were recorded. The ecosystems presented differentiat richness, regarding the species number the garden areas (128), swamps (110), fields (103), anthropized fields (95), lakes (63), dunes (58) and exotic tree monocultures (31). Among these eight threatened species were found, mainly in the swamp ecosystems. The survey has shown greater richness of native species in swamp ecosystems and in fields.