De verwildering van Ailanthus altissima (Mill.) Swingle (Hemelboom) in Rotterdam
Gorteria Dutch Botanical Archives , Volume 23 - Issue 4 p. 106- 108
The Tree-of-heaven is widely naturalized in South- and Southeast-Europe and has its Northwestern border in Germany, with outposts in urban environments. This area is expected to spread towards the Netherlands. Recent discovery of seedlings in Rotterdam and other places may show a start of this spread.
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