The aim of this work was to classify weed plants present on experimental fields in the Campus of the Federal University of Santa Maria (UFSM), RS. It has been totalized 170 species from Magnoliopsida spread on 34 families, among them the Asteraceae family was the most expressive with 60 species.O trabalho teve como objetivo o levantamento das plantas invasoras e lavouras experimentais no Campus da Universidade Federal de Santa Maria,RS. Foram totalizadas 170 espécies de Magnoliopsida distribuídas em 34 famílias, sendo Asteraceae a família nelhor representada com 60 espécies.