Fallopia ×bohemica (Chrtek & Chrtková) J. P. Bailey

English Bohemian knotweed ISEIA: B1 – Watch List
Lëtzebuergesch Béimescht Knuetkraut EASIN
Français Renouée de bohême Wikipedia: Wikipedia - Français - Renouée de bohême 
Deutsch Bastard-Knöterich Wikispecies: n/a
Nederlands Boheemse duizendknoop Back to the list of neophytes

Report the species

Report Fallopia ×bohemica to the National Museum of Natural History.

Importance and distribution in Luxembourg

Bohemian knotweed, a hybrid of Fallopia japonica and F. sachalinensis, is a generally under-recorded component of the knotweed populations, because it is not easily identified in the field. Usually, a genetic analysis is required to confirm taxonomy. The species occupies the same sort of habitats as one of its parents, the Japanese knotweed.

During an inventory along the main rivers of Luxembourg the hybrid was not recorded. However, because of the aforementioned identification problems, some of the populations identified as Japanese knotweed are in fact occurrences of its hybrid Bohemian knotweed. This assumption has been supported by genetic tests done within the scope of a monitoring project for the Natural History Museum which proved the presence of Bohemian knotweed along Mamer, Black Ernz and Gander.

As part of a study for the Department of Ecology section of the National Museum of Natural History, samples of 31 specimens of Fallopia species have been collected in 2017. The sampled specimens were described and leaves and stem parts were collected for integration in the museums herbarium. The samples have been subjected to genetic analysis by the museum’s lab. The results show that F. x bohemica is much more common than Fallopia japonica. The distribution data of both species need to be updated.

Risk assessment

ISEIA protocol: B1 (2+2+3+3) = Watch List (Ries et al. 2013: 18). Needs to be reassessed (see above).

Bibliography concerning Luxembourg

  • Glesener, B., M. Pfeiffenschneider & C. Ries, 2009. Die Verbreitung von Impatiens glandulifera, Fallopia japonica, F. sachalinensis, F. ×bohemica und Heracleum mantegazzianum entlang der Hauptfließgewässer Luxemburgs. Bull. Soc. Nat. luxemb. 110: 69-73. [PDF 470 KB]
  • Pfeiffenschneider, M., 2007. Über die Verbreitung von Heracleum mantegazzianum, Impatiens glandulifera, Fallopia japonica und F. sachali­nensis entlang der Gewässer Obersauer, Woltz, Clerve, Wiltz und ihrer Nebengewässer (Luxemburg). Bull. Soc. Nat. luxemb. 108: 7-10. [PDF 400 KB]
  • Pfeiffenschneider, M., P. Gräser & C. Ries, 2014. Distribution of selected neophytes along the national railway network of Luxembourg. Bull. Soc. Nat. luxemb. 115: 95-100. [PDF 1457 KB]
  • Pfeiffenschneider, M., P. Gräser & C. Ries, 2014. Distribution of selected neophytes along the main rivers of Luxembourg. Bull. Soc. Nat. luxemb. 115: 101-108. [PDF 3668 KB]
  • Ries, C., Y. Krippel, M. Pfeiffenschneider & S. Schneider, 2013. Environmental impact assessment and black, watch and alert list classification after the ISEIA Protocol of non-native vascular plant species in Luxembourg. Bull. Soc. Nat. luxemb. 114: 15-21. [PDF 652 KB]

Suggested citation of this webpage

Ries, C. & M. Pfeiffenschneider (Eds.), 2019. Fallopia ×bohemica (Chrtek & Chrtková) J. P. Bailey. In: neobiota.lu - Invasive Alien Species in Luxembourg. URL: https://neobiota.lu/fallopia-x-bohemica/ [21.08.2019].

 Last updated on Tuesday, July 23, 2019.