Lysichiton camtschatcensis (L.) Schott (E As.) – A very rare, locally naturalized escape from or relic of cultivation. Well-documented from the former arboretum in Rendeux where a mixed population of this species and L. americanus was introduced in the 1950’s (see also under the latter for additional information). In this locality both species are firmly established and intergrade. In 2016 a small population was also discovered in Lubbeek at the Gellenberg Castle.
Like L. americanus this species is increasing in parts of Europe and considered an aggressive invader. More information on the invasion of this species in western Europe is available here: http://www.q-bank.eu/Plants/Factsheets/Lysichiton%20camtschatcensis%20NL....
Selected literature:
Alberternst B. & Schmitz G. (2002) Vorkommen von Lysichiton camtschatcensis (L.) Schott im Taunus. Floristische Rundbriefe 36(1/2): 113-118. [available online at: http://species-id.net/o/media/d/d3/Flor.Rundbr._36%2C113-118_Alberternst...
Fujita H. & Ejima Y. (1997) Outline of life history of Lysichiton camtschatcense (Araceae). Miyabea 3: 9-15.
Hiratsuka A., Fujtaka T., Satoh K. & Akimoto J. (1995) The role of spathe and seed set of Lysichiton camtschatcense. Ecol. Rev. 23: 93-100.
Peters J.V. (1960) Rapid spreading of Lysichitum camstchaticum. Irish Naturalists' J. 13: 182-183.
Yano N. (1979) On a new locality of Lysichiton camtschatcense Scott. J. Jap. Bot. 54(1): 31-32.