Scientific NamePolygonum cuspidatum
Other Common Names:
Synonyms (former Scientific Names):
This erect perennial can grow up to 13 feet in height. It spreads through seeding, and rhizomes.
The egg shaped, alternate leaves grow from 4-6 inches in length, and 2-4 inches in width.
The stems are smooth and swollen at the joints where the leaves grow. The stem above each joint has a thin membranous sheath (ocrea).
Flower Seed Head
Small white flowers grow in clusters from the leaf axils.
The seeds are triangular and shiny, and form inside a nutlet.
This plant can be found inhabiting areas around streams and rivers. Sunlight, full shade, high salt contents, or drought does not affect this plant.
upright and nonwoody
Thorns or Spines
Approximate Flower Diameter
Dominant Flower Color
shorter than leaf
Stem Cross Section
round or oval