Muehlenbeckia complexa (A. Cunn.) Meissn. (New Zealand) – An exceptional escape from cultivation. A single young plant was discovered in a cemetery in Oudenaarde in 2016, apparently self-sown.
This species is by far the most widespread of the genus in cultivation. Also, it is one of the hardiest ones and easily withstands western European winters. It has naturalized in several countries, including Great Britain and Ireland, Portugal and Spain (Noguiera 1990, Akeroyd 2014).
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Selected references
Akeroyd J.R. (2014) Docks and knotweeds of Britain and Ireland. B.S.B.I. Handbook n°3 (2nd ed.). B.S.B.I., London: 258 p.
Noguiera I. (1990) Muehlenbeckia. In: Castroviejo S. (ed.), Flora iberica, vol. 2. Real Jardín Botánico, C.S.I.C., Madrid: 637-638. [available online at: http://www.floraiberica.es/floraiberica/texto/pdfs/02_054_08_Muehlenbeck...