The characteristics of communities found in unploughed stubble fields of the Mazowiecki Landscape Park and its agricultural buffer zone are presented in the paper. The association <i>Echinochloo-Setarietum</i> divided into a typical variant, the variant with <i>Galinsoga parviflora</i>, and the variant with <i>Bidens tripartite</i>, was the most frequently noted and floristically differentiated association. Patches of <i>Digitarietum ischaemi</i> were also frequently observed in stubble fields

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... n the poorest habitats. Rarely, on fertile soils, small patches of floristically rich communities with <i>Veronica agrestis</i> were recorded. Periodically, excessively wet habitats were seldom occupied by the speciesrichest phytocoenoses of <i>Centunculo-Anthoceretum punctati</i>. Single patches of the community with <i>Setaria pumila</i>, the form with <i>Aphanes arvensis</i>, were observed only in the south-eastern part of the Park.