Occurrence of Senecio erucifolius L. (Asteraceae) in the Western Pomerania (NW Poland)

Hoary ragwort Senecio erucifolius L. (Asteraceae) is a perennial herb with Eurasiatic distribution. The species occurs rarely in most of Poland, with centre of distribution in its SE part. The paper presents the distribution and conditions of occurrence of Senecio erucifolius in the Western Pomerania (NW Poland) with reference to intraspecific taxa. Eight localities of the species were listed and described: three presently existing localities (four populations), two localities not confirmed at present and three incorrect localities. All presently existing populations of Senecio erucifolius represent subsp. erucifolius. The populations are rather small and they are the components of three plant communities: community with Calamagrostis epigejos, association Arrhenathereteum elatioris and association Tanaceto-Artemisietum. Hoary ragwort should be recognised as an endangered species of the Western Pomerania.