EN
Cymbalaria muralis is a rare kenophyte occurring on brick and stone walls. The species is known from 157 localities situated mainly in western part of Poland. Stands of the species usually are not found to the East of Vistula river. A new locality of the species was found in the area of the historic manor house in Bachorza (Łosice district, Mazowsze Province). It is the furthest to the east locality of the species in Poland. The stand of Cymbalaria muralis covers an area of about 12 square meters in various habitat conditions. Regarding differences in humidity and insolation of the particular surfaces, 20 shoots have been investigated while alive. The stem length was measured and the number of leaves and flowers of particular shoots were counted. The results of the present study indicate that the most important features of Cymbalaria muralis stand in Bachorza are humidity and insolation intensity.