Glyceria striata (Lam.) Hitchc. is a North American species that has been recorded in most, semi-natural habitats in Europe, e.g. in meadows, bog springs, margins of water bodies. It is circumscribed within two taxa of lower rank: G. striata subsp. striata and G. striata subsp. stricta. Only G. striata subsp. stricta has been reported from Europe. This paper gives a list of the European localities of the species (48) and describes two newly discovered localities in Poland (the Wyżyna Małopolska upland and the Western Carpathian Mts.). The distribution of G. striata in Europe is mapped and potential migration routes of the species are discussed.
River valleys of the Sowie Mts and the Dzierżoniowska Basin, due to human long-term agricultural activity, were heavily transformed. Disadvantageous changes of river systems simplified penetration by invasive species. They make a serious problem to plant diversity, are burdensome to citizens, increase the threat of flooding and lower the beauty of landscape. In the middle 70-ties of 20th century, knotweed and Himalayan balsam were noticed in the Sowie Mts. In 2006 field research enabled to estimate the condition of their populations and regularity of their occurrence along the rivers near Bielawa.
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