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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Geographical distribution (from North to South: Poland, Slovakia, and Hungary) of Solidago gigantea (a) and Solidago canadensis (b), based on [3,4,5,6,7], original illustration by Szilvia Czigle.