Studies on segetal flora of the "Podlaski Przełom Bugu" Landscape Park were carried out between 1994 and 1998 on the area of 110 localities situated in 16 communes. The list of segetal flora of the area under study and its differentiation as to occurrence frequency, origin of species, persistence of species and biological spectrum is presented in the paper. The segetal flora of the "Podlaski Przełom Bugu" Landscape Park is composed of 346 taxa belonging to 39 families and 193 genera. The dominant group are species occurring very rare, rare and fairly rare. In analyzed flora apophytes prevail (65,3 %) over antropophytes (34,7 %) and annual and biennial species (56,4 %) over perennial species (43,6 %). As to biological spectrum of the studied flora 52,5 % of total number of species are terophytes, 52,3 % hemicryptophytes and 11,0 % geophytes. 39 species threatened extinction in Poland were found in agrocenosis of "Podlaski Przełom Bugu" Landscape Park. Some of them occur frequently or commonly in the studied area, others are rare in cultivation and most frequently occur in adjacent natural communities. Among segetal flora of the studied mesoregion 7 species are actuaIly endangered extinction: Valerianella dentata, Melampyrum arvense, Pnlycnemum ar vense , Herniaria hirsuta, Camelina sativa, Stachys annua, Spergula arvensis subsp. maxima.
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