Reynoutria x bohemica Chrtek et Chrtková (=Reynoutria japonica var. japonica x R. sachalinensis; syn.: Fallopia xbohemica (Chrtek et Chrtková) J.P. Bailey, Polygonum xbohemicum (Chrtek et Chrtková) Zika et Jacobson) (hort.) – An increasingly naturalised but largely overlooked alien, due to confusion with either of its parents (see also Meerts & Tiébré 2007). Known at least since 1954. At present known from many places and much commoner than Reynoutria sachalinensis but less common than R. japonica. A better knowledge will be required to know the real distribution pattern and behaviour of Reynoutria xbohemica in Belgium. It is believed to spread faster than its parents (Mandák & al. 2004). A recent survey in Croatia showed that it is by far the most common Reynoutria (Vukovic & al. 2019).
Additional information on the invasive behaviour of Reynoutria xbohemica in Belgium and elsewhere in western Europe is available at: http://ias.biodiversity.be/species/show/145 and http://www.q-bank.eu/Plants/Factsheets/Fallopia%20%20bohemica%20NL.pdf.
Reynoutria xbohemica is sometimes found with one (or rarely both) of its parents but most often without either of them.
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Selected literature:
Adolphi K. (1999) De eerste vondst van Fallopia x bohemica (Chrtek et Chrtková) J.P. Bailey in Nederland. Gorteria 25(6): 140-142.
Bailey J.P., Child L.E. & Conolly A.P. (1996) A survey of the distribution of Fallopia x bohemica (Chrtek & Chrtková) J. Bailey (Polygonaceae) in the British Isles. Watsonia 21: 187-198.
Bailey J.P. & Wisskirchen R. (2006) The distribution and origins of Fallopia x bohemica (Polygonaceae) in Europe. Nord. J. Bot. 24: 173-200.
Mandák B., Pyšek P. & Bímová K. (2004) History of the invasion and distribution of Reynoutria taxa in the Czech Republic: a hybrid spreading faster than its parents. Preslia 76: 15-64.
Meerts P. & Tiébré M.-S. (2007) Fallopia x bohemica est beaucoup plus répandu que F. sachalinensis dans la région de Bruxelles. Dumortiera 92: 22-24.
Padula M., Lastrucci L., Fiorini G., Galasso G., Zoccola A. & Quilghini G. (2008) Prime segnalazioni di Reynoutria x bohemica Chrtek & Chrtková (Polygonaceae) per l’Italia e analisi della distribuzione del genere Reynoutria Houtt. Atti Soc. It. Sci. Nat. Museo Civ. Stor. Nat. Milano 149(1): 77-108.
Pfeiffenschneider M., Gräser P. & Ries C. (2014) Distribution of selected neophytes along the national railway network of Luxembourg. Bulletin de la Société des naturalistes Luxembourgeois 115: 95-100. [available online at: http://www.snl.lu/publications/bulletin/SNL_2014_115_095_100.pdf]
Pfeiffenschneider M., Gräser P. & Ries C. (2014) Distribution of selected neophytes along the main rivers of Luxembourg. Bulletin de la Société des naturalists Luxembourgeois 115: 101-108. [available online at: http://www.snl.lu/publications/bulletin/SNL_2014_115_101_108.pdf]
Piola F., Bellvert F., Meiffren G., Rouifed S., Walker V., Comte G. & Bertrand C. (2013) Invasive Fallopia × Bohemica Interspecific Hybrids Display Different Patterns in Secondary Metabolites. EcoScience 20(3): 230-239. [available online at: http://www.bioone.org/doi/full/10.2980/20-3-3597]
Strassel L.H., Connolly B.A., Bartaula R. & Hale I. (2018) Occurrence of Knotweed Hybrid, Fallopia × bohemica (Polygonaceae) in New Hampshire. Rhodora 120(981): 77-78. [available online at: http://rhodorajournal.org/doi/pdf/10.3119/17-10]
Tiébré M.-S., Vanderhoeven S., Saad L. & Mahy G. (2007) Hybridization and sexual reproduction in the invasive alien Fallopia (Polygonaceae) complex in Belgium. Annals of Botany 99: 193-203.
Vukovic N., Šegota V., Alegro A., Koletić N., Rimac A. & Dekanić S. (2019) "Flying under the radar"-how misleading distributional data led to wrong appreciation of knotweeds invasion (Reynoutria spp.) in Croatia. BioInvasions Records [available online at: https://www.researchgate.net/publication/331045625_Flying_under_the_rada...
Zika P.F. & Jacobson A.L. (2003) An overlooked hybrid Japanese knotweed (Polygonum cuspidatum x sachalinense) in North America. Rhodora 105: 143-152.