Updated distribution of Solidago x niederederi in Poland
Solidago x niederederi (Asteraceae) is a natural hybrid between the North American native species S. canadensis and the European native species S. virgaurea which was first described from Austria at the beginning of the 20th century. It is now widespread throughout the EPPO region reported in Austria, Denmark, Germany, Italy, Lithuania, Latvia, Norway, Poland, Russia and Sweden and the United Kingdom (Great Britain). In Poland, the hybrid was first reported in 1971 from a herbarium sheet from the Faculty of Biology University of Warsaw, collected in 1957 from the Podlaskie Province. The current study details that Solidago x niederederi is now known from 55 localities within 40 cartogram units (10-km squares) within Poland. It is found mainly in abandoned agricultural fields in the North-eastern and Southern parts of the country. Commonly, Solidago x niederederi occurs together with their parental species, however, there are some localities in Poland where Solidago x niederederi occurs with neither or just one parent species. Further studies are required to assess the occurrence of the hybrid in Poland and in the rest of its range especially as the species may become more invasive in the future and pose a threat to the native S. virgaurea through introgressive hybridization.
Sources
Pliszko A, Lazarski G, Kalinowski P, Adamowski W, Rutkowski L, Puchalka R (2018) An updated distribution of Solidago x niederederi (Asteraceae) in Poland. Acta Musei Silesiae Scientiae Naturales 66, 253-258.