Koenigia weyrichii

Koenigia weyrichii
Koenigia weyrichii on Mount Nasu, Tochigi prefecture, Japan
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Caryophyllales
Family:	Polygonaceae
Genus:	Koenigia
Species:	K. weyrichii
Binomial name
Koenigia weyrichii (F.Schmidt) T.M.Schust. & Reveal [1]
Synonyms [1]
Aconogonon pseudoajanenseBarkalov & Vyschin Aconogonon savatieri(Nakai) Tzvelev Aconogonon savatieri var. iturupense(Mishurov) Tzvelev Aconogonon weyrichii(F.Schmidt) H.Hara Aconogonon weyrichii subsp. savatieri(Nakai) Tzvelev Persicaria weyrichii(F.Schmidt) H.Gross Pleuropteropyrum iturupense(Mishurov) Soják Pleuropteropyrum savatieri(Nakai) Koidz. ex Nakai Pleuropteropyrum weyrichii(F.Schmidt) H.Gross Polygonum iturupenseMishurov Polygonum weyrichiiF.Schmidt Reynoutria weyrichii(F.Schmidt) Moldenke

Koenigia weyrichii (synonym Persicaria weyrichii), ^[1] the Chinese knotweed ^[2] or Weyrich's knotweed, is a large, perennial, rhizomatous herb native to northeastern Asia in Kamchatka, Sakhalin, and northern and central Japan. ^[1] It is also locally naturalised in northern Europe.

It is one of the parents of the cultivated hybrid Koenigia × fennica, the other being Koenigia alpina . ^{[3] [4]}

References

1. "Koenigia weyrichii (F.Schmidt) T.M.Schust. & Reveal". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2019-02-24.
2. BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.
3. "Aconogonon × fennicum Reiersen". The International Plant Names Index . Retrieved 2020-05-21.
4. Jonsell, Beagt (1999). "Additional nomenclatural notes to Flora Nordica (Lycopodiaceae - Polygonaceae)". Nordic Journal of Botany. 19 (2): 385–387. doi:10.1111/j.1756-1051.1999.tb01219.x.

• Online Atlas of the British & Irish Flora entry