Japanese Knotweed     Information
INVASIVE
Scientific Name:Fallopia japonica
Altenative names, synonyms, exist for this plant. See RPC Plant Details and check the refernce websites for additional information.
Synonym:Reynoutria japonica
Variety: Japonica


NOTES: Semi-woody perennial that spreads by long rhizomes and occasionally by seeds. Native to eastern Asia in Japan, China, and Korea.

Japanese Knotweed classification has been debated by taxonomists. There are a number of scientific names including Fallopia japonica, Pleuropterus cuspidatus, Pleuropterus zuccarinii, Polygonum cuspidatum var. compactum, Polygonum zuccarinii, and Reynoutria japonica.

Additional Information

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Japanese Knotweed
Genus species: Fallopia japonica
     Synonym: Reynoutria japonica
Common Name: Japanese Knotweed
Variety:Japonica
Family Name: Polygonaceae  
Annual or perennial herbs, or woody vines; leaves alternate, simple, mostly entire, stipules typically united into an ocrea (a tubular, papery sheath); flowers bisexual or unisexual, regular, in short axillary clusters or in various elongate inflorescences; fruit a trigonous or lenticular achene.
Seed Type: Angiosperm
Origin:  
Native: native to North America.
Non-native: not native to North America.
Introduced Native: native to North
America, but not Rowe Woods.
* Definitions based on the USDA
terminology
Nonnative
Category:Wildflower
Flower Color:White


Identified by:M. Becus
Months in Bloom:  
The highlighted month(s) in this chart indicate when the plant has been observed blooming.
Jan Feb Mar Apr May
Jul Aug Sep Oct Nov Dec

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