Ray's Knotweed (Polygonum raii Bab.)
Also classified as Polygonum oxyspermum subsp. raii (Bab.) D.A.Webb & Chater.
Some sources treat this taxon as a subspecies of sharp-fruited knotweed (Polygonum oxyspermum), ssp. raii. We treat them as separate species, per POWO's treatment.
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↑Range
This species has been introduced in eastern Canada; we have yet to build its map.↑Links & External Resources
• Polygonum raii (Ray's knotweed) | USDA PLANTS Database (About This Site)
• Polygonum raii | Biota of North America Project (BONAP) (About This Site)
• Polygonum raii | NatureServe Explorer (About This Site)
• Polygonum raii Bab. | Plants of the World Online (POWO) (About This Site)
