4. Reynoutria sachalinensis (F. Schmidt Petrop.) Nakai (syn.: Fallopia sachalinensis (F. Schmidt Petrop.) Ronse Decraene, Polygonum cuspidatum F. Schmidt Petrop.) (Sakhalin, N-Japan) – A locally naturalised and slightly increasing alien. Much more rare than Reynoutria japonica and their hybrid and probably often confused with the latter (see Meerts & Tiébré 2007). Known at least since 1924 (Wuustwezel) and now present in widely scattered locations. Well-represented in the surroundings of Brussel (although, at least in part, also confused with Reynoutria xbohemica; see Meerts & Tiébré l.c.), the Kempen and around Gent. Reynoutria sachalinensis usually grows in similar habitats like R. japonica and R. xbohemica (often together with one of both) but, its vigour in spite, apparently is less invasive in Belgium.
Additional information on the invasive behaviour of Reynoutria sachalinensis in Belgium and elsewhere in western Europe is available at: http://ias.biodiversity.be/species/show/144 and http://www.q-bank.eu/Plants/Factsheets/Fallopia%20sachalinensis%20NL.pdf.
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Selected literature:
Conolly A.P. (1977) The distribution and history in the British Isles of some alien species of Polygonum and Reynoutria. Watsonia 11: 291-311.
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.
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]
Verloove F. (2002) Ingeburgerde plantensoorten in Vlaanderen. Mededeling van het Instituut voor Natuurbehoud n° 20: 227 p.
Verloove F. (2006) Fallopia sachalinensis. In: Van Landuyt W., Hoste I., Vanhecke L., Van den Bremt P., Vercruysse W. & De Beer D., Atlas van de flora van Vlaanderen en het Brussels gewest. Instituut voor Natuur- en Bosonderzoek, Nationale Plantentuin van België en Flo.Wer: 401.