Knotweed/Smartweed
Polygonum spp.
Family: Polygonaceae

Habitat:

Stream and river banks, other wet soils

Location relative to water:

Rooted onshore

Leaves:

  • Arrowhead-shaped, lance-shaped or oval
  • Tubular sheath around stem and above each node formed by joined stipules
  • Irregular, jagged margin, sometimes fringed with bristles

Flowers:

 
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