Biological invasions are increasingly common worldwide due to continuous transformations that environments have been undergoing. Thus, this study aimed to catalog the exotic invasive species that occur on different environments at the Agricultural Sciences Campus from the Federal University of the São Francisco Valley, Petrolina-PE and to measure the distribution of the species diversity in the evaluated environments. The study area was initially divided into six environments. By walking around (active search) through these environments, all exotic invasive species were collected and herborized. Overall, 29 species were sampled, distributed into 16 genera and 12 families. From all catalogued species, 18 were herbs, four trees, four climbing plants and three were bushes. Regarding their origin, 13 were from African continent, one from Europe, two from Asia, two from India, one from Madagascar and four from Central America. Some species still have natural occurrence at more than one continent. The ruderal environments showed greater similarity to each other, with a percentage of exotic invasive species in common, equal or greater than 75%. This study suggests that modified (degraded) environments are enabler of biological invasions.

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This study aims to assess the richness of knowledge about medicinal plants in the Truká indigenous community, highlighting the most important ones, as well as verifying whether that knowledge is influenced by socioeconomic factors. A survey on species used as therapeutic resources was carried out through semi-structured interviews, and the indices of use value (UV), relative importance (RI), and salience (SI) of the species were calculated. Additionally, the relationship of socioeconomic factors with the knowledge of medicinal plants was evaluated using generalized linear models (GLM). Ninety-nine ethnospecies were registered, and those most relevant to the indigenous community were among the botanical families Fabaceae and Lamiaceae. The plants most important to the residents of the community were used mainly for hypertension and anxiety. Older people, and those with a greater number of residents at home and lower income, knew a greater number of medicinal plants.