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This article discusses the discovery of Alternanthera maritima, a plant species, in Sicily, which is the first record of this species in Europe. The article examines the physical characteristics of the collected specimens and explores the ecological aspects of the community where they were found. It also examines the taxonomic complexity of the Alternanthera genus and evaluates the potential invasiveness of this new finding. The article provides detailed information on identifying the species and compares it to other known Alternanthera species. The article highlights the taxonomic uncertainty of the Alternanthera genus and the potential invasiveness of Alternanthera maritima in Sicily. The arrival of this species in Sicily is likely recent and linked to human dispersal. Although the species is currently confined to a playground area, there is a possibility of further spread and potential invasion. The article suggests monitoring and early eradication as potential strategies to prevent the species from becoming problematic. The document also includes a list of references and sources related to the plant species Alternanthera philoxeroides, including taxonomic revisions, studies on its invasive nature, and research on its genetic and phenotypic characteristics. These references provide information on the species' distribution in different regions, its ecological impact, and its potential to adapt to environmental change. The document also provides links to online resources for further information on Alternanthera philoxeroides. [Extracted from the article]