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Plant Database

Search for native plants by scientific name, common name or family. If you are not sure what you are looking for, try the Combination Search or our Recommended Species lists.

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Polygonum raii

Polygonum raii Bab.

Ray's Knotweed

Polygonaceae (Buckwheat Family)

Synonym(s): Polygonum oxyspermum ssp. raii

USDA Symbol: PORA6

USDA Native Status: L48 (N), CAN (N), SPM (N)

 

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Plant Characteristics

Duration: Annual
Habit: Herb
Fruit Type: Achene
Size Notes: Stems prostrate to ascending, up to about 3 feet long.

Bloom Information

Bloom Color: White , Pink , Green
Bloom Time: Jul , Aug , Sep , Oct

Distribution

USA: ME
Canada: NB , NL , NS , PE , QC
Native Distribution: Flora of North America considers this species introduced in North America. USDA Plants considers it native.

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Polygonum raii in USDA Plants
FNA: Find Polygonum raii in the Flora of North America (if available)
Google: Search Google for Polygonum raii

Metadata

Record Modified: 2022-12-07
Research By: TWC Staff

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