Łąki selernicowe (związek Cnidion dubii Bal.-Tul. 1966) w Polsce [Meadow communities of Cnidion dubii Bal.-Tul. 1966 alliance in Poland]

The paper contains a characterization of the alliance <em>Cnidion dubii</em> Bal.-Tul. 1966 and of the association<em> Violo-Cnidietum dubii</em> Walther in Tx. 1954, belonging to it, both of which so far unreported from Poland. The syntaxonomy of those units has been based on analytic-synthetical phytosociological studies with the use of numerical classification and ordination methods, mainly of the TWINSPAN program. To demonstrate the distinct character of the units under study from Poland, the alliance <em>Cnidion dubii</em> has been analysed in comparison with the alliances <em>Molinion caeruleae</em> and <em>Alopecurion pratensis</em>. The identify of the association has been established by analysing Polish and European materials. New criteria have been proposed for the diagnosis of the associations of the alliance <em>Cnidion dubii</em> in Central Europe. The rank of some diagnostic species of the association and of the alliance has been verified. The nomenclature of the units has been based on the principles of the Code of phytosociological nomenclature. The association <em>Violo-Cnidietum dubii</em> from the area of Poland has been characterized syntaxonomically, synchorologically and synecologically. Three subassociations have been described: <em>Violo-Cnidietum dubii</em> Walther in Tx. 1954 <em>typicum</em>, <em>V.-C.d. stellarietosum palustris</em> T. Załuski subass. nova, <em>V.-C.d. galietosum veris</em> T. Załuski subass. nova, including eight variants. At the same time, the distinct character of communities with <em>Cnidium dubium</em> and <em>Molinia caerulea</em> has been demonstrated, and they have been classified with <em>Molinietum caeruleae</em> W. Koch 1926 <em>cnidietosum dubii</em> T. Załuski subass. nova.