The paper presents the new locality of Ostericum palustre Besser - a very rare and threatened species in Poland and whole Europe. The species has also been placed under strict protection as well as under the Bern and the Habitats Directive. The new population, were found in wet meadow, belongs to the Molinio-Arrhenathereta class, on the borderline between Płaskowyż Jędrzejowski plateau, and Niecka Włoszczowska basin in the Wyżyna Małopolska upland (midsouthern Poland)
