Inuletum ensifoliae Kozł. 1925 in the area of the deserted quarry "Piotrawin" situated at the edge of the Vistula River.
Xerothermic grasslands found in Poland are precious phytocenoses increasing biodiversity. They are generally settled on small surfaces, mainly on strongly insolated (southern, south western and south eastern exposure), i.e. on dry and warm slopes. They are also found on slopes of completely exploited quarries. Limestone substrata (including Seon marls) are optimum settlements for the development of grassland communities including the floral association of Inuletum ensifoliae. The studies were carried out on two terraces of unused quarry "Piotrawin" during the years 2001 and 2011. The quarry was reclaimed by technical and biological methods in 1995 and 1996. On the slopes two terraces were formed on which a series of xerothermic grasslands species were introduced (including Linum flavum, Inula ensifolia). In both years the terraces were settled by phytocenoses of the Inuletum ensifoliae association. Characteristic and distinguishing species of the Festuco-Brometea (34 taxa) classes are dominant in them. Patches of the community are settled by such species of ruderal (Artemisietea vulgaris) and seminatural (Molinio-Arrhenatheretea) communities. In the structure of the association of 2011 the contribution of species of these phytosociological classes decreased significantly. Reduced were also the species of segetal communities (Stellarietea mediae class), whereas slightly more species of scrub communities (Rhamno-Prunetea class) were observed in the association. In 2011 the cover of a series of species of the Festuco-Brometea class: Anthyllis vulneraria ssp. polyphylla, Sanguisorba minor, Medicago falcata, Salvia verticillata, Euphorbia cyparissias, Thymus pulegioides and others inceased distinctly. After 10 years a series of species that were introduced during biological land reclamation are not found in the community. As far as shrubs are concerned, Cornus sanguinea were not found, and as regards herbage, Adonis vernalis, Stipa capillata and Aster amellus did not occur. The remaining species introduced during land reclamation settled in the phytocenoses in both years of the studies. The process of succession that takes place in the Inuletum ensifoliae community stabilizes its structure and floristic composition. A potential threat to this community can be the invasion of the species of scrub communities, mainly those of the Pruno-Ligustretum association.