A find of Marsilea quadrifolia L. (Marsileaceae) in two localities in Kozynskyi reserve, within the Kozynka River valley near Kozyn village, Obukhiv District, Kyiv Region is reported. Features of the species habitat are described. Natural or anthropogenic origin of the new localities of M. quadrifolia is considered. Possible consequences of introduction of the plant species widely used in aquariums into natural habitat are discussed.
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