Zone de Texte: The need for common definitions Zone de Texte: Casual alien species: alien plants that may flourish and even reproduce occasionally outside cultivation in an area, but that eventually die out because they do not form self-replacing populations, and rely on repeated introductions for their persistence Zone de Texte: Naturalised species: alien invasive species that sustain self-replacing populations for at least 10 years without direct intervention by people by recruitment from seed or ramets capable of independent growth. Zone de Texte: According to Pysek ? al., 2004

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