In the present work, phytosociological survey and analysis of toxic or non toxics species that invade the pastures, was carried out in Selvíria, State of Mato Grosso do Sul. Periodically 10 infested farms of the region were visited, and weed species collected for for identification. The survey was undertaken quantitatively and qualitatively, describing the main characteristics of the plant species. Seventy two plant species were identified, few of them with generalized distribution. MALVACEA presented the highest number of individuals, and the highest density. ASTERACEAE and LEGUMINOSAE, presented the highest number of species. The most abundant species were: Sida rhombifolia var. typica K. Schum and Sida cordifolia L., both classified as solitary individuals (sol). The species with the highest frequency was S. cordifolia L., with 64,5% of occurrence in relation to the total area investigated. For the localities studied the coefficient of similarity varied from 12.6% to 80% with average of 55,8% ± 1,95. Various toxic species of suspectable species that may casue intoxication in cattles were also identified.
Survey; pastures; weeds; phytossociological analysis; toxic plants