Pollen data of Betula nana L., Alnus fruticosa Rupr. and Botrychium cf. boreale Milde from the Late Dryas sediments of the plain part of Ukraine are provided. Currently, these species have not been involved in the formation of vegetation in Ukraine. It has been found that Betula nana, Alnus fruticosa and Botrychium cf. boreale were components of the periglacial communities in the forest and steppe zones of Ukraine during the Late Dryas. Paleopalynological materials showed that Betula nana and Botrychium cf. boreale were distributed both to the east and to the west of the Dnieper in these zones. Distribution of Alnus fruticosa was limited by the forest area and left-bank part of the forest-steppe zone. Today, the range of this species is within the permafrost zone. The first map of distribution of Betula nana, Alnus fruticosa and Botrychium cf. boreale within the plain part of Ukraine was developed. The climate warming of the interglacial rank on the border of the Late Glacial (Late Dryas) and Holocene (Preboreal) influenced the process of disintegration of periglacial communities, which was followed by the disappearance of Betula nana, Alnus fruticosa and Botrychium cf. boreale from the Ukrainian flora.

Keywords: paleopalynology, paleochorology, Betula nana, Alnus fruticosa, Botrychium cf. boreale, Late Dryas, Ukraine

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