Brazilian fruit growing is of great economic and social importance for Brazilian states. Roraima has great potential to stand out in the fruit market, as it has a favorable climate, especially orange as one of the main agricultural productions of the municipality of Rorainópolis. The identification of weeds are indispensable for the managements to be used, since each species has a different potential to inphscore the plantation area, competing with the crop for space, water, light and nutrients. Weeds, when controlled and maintained at acceptable levels of coexistence with the crop, provide a number of benefits such as soil cover, addition of organic matter and indicator of physical and chemical characteristics of the soil. The study was carried out at the Henz farm, located on highway BR-147, Km 456, in an area of 2 hectares of orange (Citrus sinensis), with spacing of 3 x 7 m (425 plants.h-1). The identification and counting of species at each sampling point allowed the calculating of the following phytosociological variables: (D), (Dr%), (A), (Air%), (F%), (Fr%), (IVI), and (Ir%). The present work aimed to conduct a phytosociological survey of weed communities present in orange orchards in the southern region of Roraima. Where the main families found were Poaceae, Cyperaceae and Asteraceae, and the main species were species Axonopus fissifolius, Uroclhoa plantaginea and Mimosa pudica. They had the highest values of phytosociological parameters, with the exception of the species Eragrostis pilosa and Humidia Urochloa, which presented the highest values of (A) and (Air%).