Abstract
Lindernia dubia (L.) Pennell, a Northern-American species, was recently found in two localities in central Slovakia (near Trenč and Štiavnické Bane villages) as a new species for the flora of Slovakia. Individuals of the species grew in wetland vegetation of the class Isoëto-Nano-Juncetea in both cases. The second mentioned locality probably belongs to the altitudinal maxima of L. dubia in Europe. Although the origin of L. dubia in the Slovak localities remains unknown, we suppose that zoochory or anthropochory are the most probable modes of its introduction into the territory of Slovakia.
Acknowledgements
We wish to thank Erik Simons (the Netherlands), Rossen Tzonev (Bulgaria) for providing us with their unpublished data for discussion in this paper and two anonymous reviewers for their comments. This work was supported by the Slovak Research and Development Agency under the contract No. APVV-0059-11 and by Institute of Botany CAS (project nr. RVO 67985939) and by the Czech Science Foundation (Centre of Excellence PLADIAS, 14–36079G).
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