Abstract
Communities of hay meadows with Arrhenatherum elatius form phytocenoses of at least two plant communities: Arrhenatheretum elatioris - semi-natural habitats, and Tanaceto-Arrhenatheretum elatioris - ruderal habitats. The communities of tall oat-grass include approximately 150 species of vascular plants. In central Poland Tanaceto-Arrhenatheretum is the main habitat for many species characteristic of the Arrhenathe- rion alliance, including: Pastinaca sativa, Knautia arvensis, Tragopogon pratensis. Hay meadows are vulnerable (VU) components of vegetation of the characterized region. There is a need to verify syntaxonomic units within the Arrhenatherion alliance and phytosociological identifiers of Natura 2000 habitats - extensively used hay lowland meadows (6510).
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