Composition and similarity of flora associated with anthropogenic sites in the city of João Pessoa - Paraíba

This study presents the floristic composition and similarity of synanthropic vascular plant species in an anthropogenic peri-urban area in the city of Joao Pessoa, in the state of Paraiba, and how it is related to other synanthropic floras. A total of 98 species in 75 genera and 30 families were found. Among the species, 41.84% are cosmopolitan, 29.6% pantropical, 13.3% occur only in the Southern Cone of America, 8.2% are Neotropical, 5.1% gondwanic and 2% occurs across America. Asteraceae and Poaceae were the families with the biggest number of species. The results were compared with other related floristic surveys using Sorensen's similarity coefficient, and it was observed that not it is only the geographical proximity of the two locations that reflects a higher floristic similarity between areas but also the extent of the taxa and the presence of a similar microhabitat. The study focuses on an area located in the Brazil's Midwest region.