The paper presents the results of floristic and vegetation analyses of the landfill Supíkovice. Ruderal, segetal and meadow vegetation units were recorded in June 2015. The most interesting findings were threatened weed species growing in decontamination patches on loamy and nutrient-poor soils in the central part of the landfill. Dianthus armeria (C4a) and Filago arvensis (C3) are listed in the national Red List of the Czech Republic. Moreover, these taxa were evaluated in the same category of rarity on the regional level. Apart from the above mentioned, Centaurea cyanus (C4a) and Papaver dubium (C4a), registered only in the regional Red List of vascular plants of the Moravian-Silesian Region (see methods), were found. Besides threatened species, relatively small populations of invasive taxa as Erigeron annuus, Impatiens parviflora or Reynoutria sp., were also recorded on the landfill Supíkovice.
New floristic records of weed species were taken from cereal fields in June 2012 from localities in Akçabey village, Kayıkçılar village and from Degirmenağzı in Zonguldak province (Turkey). The records represent a total of 69 taxa belonging to 24 families from which the most frequent are Fabaceae (13,04%), Asteraceae (10,14%), Poaceae (10,14%), Rosaceae (8.7%), Apiaceae (7,25%) and Ranunculaceae (5.8%). Most of listed species are native in flora of Turkey and also occur as threatened taxa in the flora of the Czech Republic as naturalized or casual archaeophytes (Agrostemma githago, Bromus arvensis), casual neophytes (Medicago polymorpha, Trifolium tomentosum) or as native species (Aphanes australis, Filago vulgaris).