Native Plants
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.
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)
From the Image Gallery
No images of this plant
Plant Characteristics
Duration: AnnualHabit: Herb
Fruit Type: Achene
Size Notes: Stems prostrate to ascending, up to about 3 feet long.
Bloom Information
Bloom Color: White , Pink , GreenBloom Time: Jul , Aug , Sep , Oct
Distribution
USA: MECanada: 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 PlantsFNA: Find Polygonum raii in the Flora of North America (if available)
Google: Search Google for Polygonum raii
Metadata
Record Modified: 2022-12-07Research By: TWC Staff