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Introduced in Europe for the first time as a medicinal plant (around the 1630) and later as an ornamental, Asclepias syriaca L. has escaped from culture and became subspontaneous. Today, this species raises serious threats of invasion in some European countries, such as Hungary, for example. In this paper, we discuss the spread of the species in the Romanian Banat, especially in the spontaneous vegetation. The first reports in the region are those from the Romanian Flora. We found this species in different habitat...