Limnobium laevigatum (Humb. & Bonpl. ex Willd.) Heine (syn.: Limnobium stoloniferum (G. Mey.) Griseb., Hydromystria laevigata (Humb. & Bonpl. ex Willd.) Hunz., Salvinia laevigata Humb. & Bonpl. ex Willd.) (Mexico, S-Am., Antilles) – An exceptional and probably ephemeral escape or throw-out. Several small populations (with at least one hundred individuals) were discovered in a riverlet (Molenbeek) in Ganshoren in 2013.
Given its reputation as a troublesome aquatic weed the species was removed shortly after its discovery (although it is rather unlikely that Limnobium could survive western European winters).
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Selected literature:
Crusio W. (1982) Einige Bemerkungen zu Limnobium Rich. Aqua Planta 7(4): 11.
Crusio W.E. (1983) Einige Bemerkungen zu Limnobium Rich. ZAG Wasserpfl. AM 1: 5.
Hunziker A.T. (1981) Hydromystria laevigata (Hydrocharitaceae) en el centro de Argentina. Lorentzia 4: 5-8.
Hunziker A.T. (1982) Observaciones biológicas y taxonómicas sobre Hydromystria laevigata (Hydrocharitaceae). Taxon 31: 472-477.
Moscone E.A. & Bernardello L.M. (1985) Chromosome studies on Hydromystria laevigata (Hydrocharitaceae). Ann. Missouri Bot. Gard. 72(3): 480-484.
Schopfel H. (1974) Limnobium laevigatum (Humb. et Bonpl. ex Willd). Inform. ZAG Wasserpfl. 1(2).
Van Bruggen H.W.E. (1973) Eine Namensanderung! Inform. ZAG Wasserpflanzen 3: 6.