E-Flora BC: Electronic Atlas of the Flora of British Columbia

Reynoutria x bohemica (J. Chrtek & A. Chrtkova) J.P. Bailey
Bohemian knotweed
Polygonaceae (Buckwheat family)

Introduction to Vascular Plants

© Brian Klinkenberg  Email the photographer   (Photo ID #20327)

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Distribution of Reynoutria x bohemica
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Bohemian knotweed, like Japanese knotweed (Fallopia japonica) and Giant knotweed (Fallopia sachalinensis), is a robust plant of disturbed sites that is often escaped and invasive in the province. It is a hybrid between F. japonica and F. sachalinensis and is common in the lower Fraser Delta. Plants are generally intermediate between the two parent species: that is, leaf morphology ranges from the cordate leaves of F. sachalinensis to the flat-bottomed leaves of F. japonica, and various intermediate forms may appear on a single plant. It is most reliably distinguished by the pubescence along the veins on the lower surface of new leaf growth in the spring. Freeman and Hinds (2010) in Flora North America gives the height for the hybrid as also intermediate (2.5 m), however hybrids have been observed in the Fraser delta that are up to 3.5 meters in height. Stems show the typical knotweed colouration. Bohemian knotweed was not noticed in the North American flora until it was reported by Zika and Jacobson in 2003. A key to Fallopia is provided by Freeman and Hinds (2010) in Flora North America, and a detailed description of Bohemian knotweed is provided here.

Synonyms and Alternate Names

Fallopia x bohemica

Taxonomic and Nomenclatural Links

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