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.
Quick facts Scientific classification, Binomial name ...
| 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
|
| Synonyms[1] |
- Aconogonon pseudoajanense Barkalov & 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 iturupense Mishurov
- Polygonum weyrichii F.Schmidt
- Reynoutria weyrichii (F.Schmidt) Moldenke
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It is one of the parents of the cultivated hybrid Koenigia × fennica, the other being Koenigia alpina.[3][4]
