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EN
The list of 46 self-sowing alien woody plant taxa in Rogów Arboretum is presented, which is an expantion of the list from 1992 when the first article on spontaneous regeneration of alien tree and shrub taxa in the Arboretum was published. Most of species described are rather infrequently found in Polish collections and are known to produce self-seedlings not capable of sexual reproduction, however Abies grandis can be included into group of plants that could produce seedlings capable of sexual reproduction.
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EN
new cultivar of Japanese Cedar is described and illustrated. It originated from seeds received in 1961 from Gadow Arboretum (E Germany) and was propagated by cuttings in 1978 and 1985. The maternal tree in Rogów was killed by frosts during severe winter of 1986/87. The newly described form differs from the type in having very short needles.
EN
The Balkan pine (Pinus peuce) is a Balkan Peninsula endemic tree species, growing in high mountains of Bulgaria, Macedonia, Serbia, Montenegro, Kosovo, Albania, and Greece and forming pure and mixed stands in subalpine forests. The paper gives a survey of biodiversity of Balkan pine stands in the Rogów Arboretum in reference to environmental data. In the plots examined, 29 taxa of vascular plants, 29 taxa of macrofungi and 127 taxa of invertebrates were recorded. The revealed diversity is discussed with regard to the data from Pinus peuce natural habitats.
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