In the botanical gardens and arboreta of Berlin many vascular plant taxa have been cultivated since 1573. The influence on the composition of the flora of Berlin by the dispersal of plants escaping from its botanical gardens is assessed. Some spectacular examples are known: Galinsoga parviflora, Matricaria discoidea, Parietaria pensylvanica, but no systematic survey exists. Arboreta are of importance for some trees and shrubs because of a deliberate release in great quantities.
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Vol. 36 • No. 1