1. Elodea canadensis Michaux (N-Am.) – A more or less widely naturalised alien, but recently slightly decreasing, possibly in favour of Elodea nuttallii. First recorded in Belgium around 1861 and much extending soon after its original discovery, primarily in Flanders and in the lower parts of Wallonia. Usually found in canals, river branches, ditches or ponds.
Initially considered as a noxious environmental weed but this seems to be no longer the case. Eutrophication and changed maintenance techniques of canals and ditches might have been responsible for the decrease of Elodea canadensis. Additional information on its invasion status in Belgium is available at: http://ias.biodiversity.be/species/show/56.
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Selected literature:
Hussner A. (2006) Die aquatischen Neophyten in Nordrhein-Westfalen. Decheniana 159: 39-50.
Poulis G. & Zervas D. (2017) First confirmed record of Elodea canadensis Michx. (Hydrocharitaceae) in Greece. Hacquetia 16(2): 175-179.
Vanhecke L. (2006a) Elodea canadensis. In: Van Landuyt W., Hoste I., Vanhecke L., Van den Bremt P., Vercruysse W. & De Beer D., Atlas van de Flora van Vlaanderen en het Brussels Gewest. Instituut voor natuur- en bosonderzoek, Nationale Plantentuin van België en Flo.Wer: 361.