Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

New and rare alien vascular plant species in the Republic of Karelia.

Abstract

Information on 8 alien species recorded in Karelia for the first time and 3 alien species rare in the Region is given. Acer pseudoplatanus, Crataegus maximowiczii and Prunus maackii discovered in natural forests in the vicinity of the Petrozavodsk University Botanical Garden are probably past the first stage of naturalization. They can be classified as at least potentially invasive species, especially Prunus maackii, dozens of which are present in a rather large area. The discovery of Alchemilla cheirochlora, A. integribasis, A. parcipila, and A. trichocrater adds significantly to the knowledge of the secondary distribution range of these species, which had until recently been known mainly in Central European Russia and further to the east, sometimes from only a few localities. An accidentally introduced Amaranthus blitum was found in the species' northernmost location in Russia. The finding of the fairly widely cultivated in Karelia Antirrhinum majus as a wild-growing plant was only a matter of time. The emergence of Citrullus lanatus and Cucumis melo is associated with unusually warm summer and early autumn of 2018 in Karelia, which promoted outdoor recreation activity and, as a result, the disposal of melon and watermelon seeds in recreation sites, as well as their germination in the same growing season. The latter four species are undoubtedly ephemerophytes. The possible pathways and time of introduction of each species are discussed.