54Memoranda Soc. Fauna Flora Fennica 92: 54–78.Hæggström 2016 et al. • Memoranda Soc. Fauna Flora Fennica 92, 2016 Allium ursinum (Alliaceae) in Finland Carl-Adam Hæggström, Eeva Hæggström, Ralf Carlsson & Mikael von Numers Hæggström, C.-A., Finnish Museum of Natural History, Botany Unit, P.O. Box 7, FI-00014 University of Helsinki, Finland. E-mail:
[email protected] Hæggström, E., Tornfalksvägen 2/26, FI-02620 Esbo, Finland. E-mail: eeva.haeggstrom@ kolumbus.fi Carlsson, R., Högbackagatan 10, AX-22100 Mariehamn, Åland, Finland. E-mail: ralf.carlsson@ aland.net von Numers, M., Environmental and Marine Biology, Åbo Akademi University, Artillerigatan 6, FI-20520 Åbo, Finland. E-mail:
[email protected] Allium ursinum L. is a perennial bulbous herb of broad-leaved woods of Western and Central Europe. Of two subspecies subsp. ursinum is distributed in Western Europe including the Nordic countries. The general distribution of A. ursinum in the Nordic countries is outlined. The localities for A. ursinum in Finland are the northeasternmost in Europe. The rather few localities are concen- trated to the Åland Islands (Al) and the archipelago of Regio Aboënsis (Ab). They are described in a chronological order of the first find in each municipality. Several localities with A. ursinum as a cultivated plant or as a garden escape are referred to. The habitat requirements for Allium ursinum are discussed. Although A. ursinum has a broad distribution with a clear tendency to occur as a weed, it is still a habitat specialist with a rather narrow range of ecological tolerance as it requires a mesic well-drained soil and drought as well as waterlogging seem to be unfavourable.