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The steeplebush is a shrub growing naturally in North America. In Europe this species has been cultivated as an ornamental plant since the 18th century. It has been observed in spontaneously developing secondary localities in such countries as Belgium, Denmark, Sweden, Norway and Germany. In Poland there are three regions in which Spiraea tomentosa is known to be a permanently established anthropophyte:...
The Turkey oak (Quercus cerris L.) is one of the least known species of trees of alien origin introduced to forests in Poland. Its natural geographical range embraces southern Europe and Asia Minor. It started to be grown on the Polish lands in 1813, planted primarily in parks and gardens, mostly in the western part of the country. On the basis of the present authors’ own field search, the literature,...
Black cherry (Prunus serotina Ehrh.) belongs to quite common and the best known invasive woody plants of alien origin occurring in central Europe. On the other hand, little is known about the degree of settling of another North American representative of the Prunus genus from the Padus subgenus – the chokecherry (P. virginiana L.). A considerable morphological similarity of the above-mentioned taxon...
Among many threats to global biodiversity, invasion by alien species are perceived as very important. Activities aimed at counteracting this process should be preceded by updating the list of alien species and choosing appropriate terminology and classifications. In the paper, terminology still used by Polish authors is compared with that used in current English-language publications. Some examples...
Lasy i zarośla lęgowe stanowią charakterystyczny element krajobrazu naturalnego dolin rzecznych. Ich siedliska rozmieszczone są zwykle w postaci pasm wzdłuż koryta rzecznego w zasięgu periodycznych i epizodycznych zalewów. W warunkach dolin średnich i dużych rzek Polski niżowej zbiorowiska lasów i zarośli łęgowych tworzą swoistą sekwencję, od zarośli Salicelum triandro-viminalis na krawędzi łożyska...
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