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The paper presents new localities of 15 vascular plants recorded in the Polish part of the Lithuanian Lakeland, north-eastern Poland in 2017-2018, using the ATPOL cartogram method. Crepis capillaris, Diplotaxis tenuifolia, Eragrostis albensis, Matthiola longipetala, Oenothera fruticosa, Oenothera glazioviana and Rubus armeniacus are listed as new species for the regional flora. [ABSTRACT FROM AUTHOR]

The paper deals with Solidago ×snarskisii, a natural hybrid between the North American S. gigantea and the European S. virgaurea, as a new casual alien species to the flora of Poland. It was found in August 2018 in the town of Suwałki, NE Poland, growing on a fallow land among its parental species. The population of the hybrid consisted of one cluster of shoots, including four generative and three vegetative shoots, and it was associated with meadow, grassland, and ruderal plant species. The locality of S. ×snarskisii in Poland was mapped using the ATPOL cartogram method. [ABSTRACT FROM AUTHOR]

Invasive aquatic plants can spread rapidly causing many negative effects on both the structure and functioning of aquatic ecosystems. They can also hinder navigation, fishing, water tourism, and recreation. Early detection and rapid response to invasive aquatic plants can prevent their further spread and negative impacts. In this study, we present the first record of two invasive alien aquatic plants Limnobium laevigatum and Pontederia crassipes in Poland. The plants were found in an artificial pond in the eastern part of the city of Kraków, southern Poland, on 16 September 2020. The pond was also occupied by Pistia stratiotes, another invasive alien aquatic plant that has been recently recorded in Poland. The locality is mapped using the ATPOL cartogram method, photographic documentation of the habitat and species is provided and the status of L. laevigatum and P. crassipes in the Polish flora is discussed. [ABSTRACT FROM AUTHOR]