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Muránska planina Mts, a small karstic area situated in the southern part of the Western Carpathians in Central Slovakia was chosen as a model region for the study of the variability and diversity patterns of thermophilous and mountain non-forest vegetation on the crossing of the Carpathian and Pannonian bioregions. Altogether, 113 new relevés were sampled using standard methods of the Zürich-Montpellier approach and compared with previously published data. The dataset containing both new and published phytosociological relevés from dry, semi-dry and mesic grasslands (265 relevés) was analysed using the program JUICE 7.0.98. The Beta flexible method, relative Sorensen distance as a similarity measure, and logarithmic transformation of species covers were used for the numerical classification (PC-ORD). The main environmental gradients of species composition were analysed by DCA in the CANOCO 4.5 package using the Borhidi indicator values. The various mosaics of plant communities were detected in succession series from pioneer rocky stands through open rocky grasslands dominated by Festuca pallens, F. tatrae, Carex humilis and Sesleria albicans to closed tall grass communities dominated by Calamagrostis varia and C. arundinacea. Plant communities belonging to six classes (Sedo-Scleranthetea, Festuco-Brometea, Elyno-Seslerietea, Thlaspietea rotundifolii, Mulgedio-Aconitetea and Molinio-Arrhenatheretea) including Pannonian grasslands of the alliance Bromo pannonici-Festucion pallentis and high montane/subalpine grasslands of the alliance Astero alpini-Seslerion calcariae occur together in the study area. High floristic richness and extraordinary diffusion of thermophilous and montane/subalpine elements is characteristic for the majority of the studied plant communities.