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  1. Life
  2. Plants
  3. Vascular Plants
  4. Dicots
  5. Pinks, Cactuses, and Allies
  6. Knotweed Family
  7. Knotweeds
  8. Knotgrass
  9. Douglas' Knotweed

species 1,406 observations

Douglas' Knotweed

Polygonum douglasii

Status
native
Traits
Where
In the US
Source
iNaturalist

Field notes

Supports All

93 native animals
supported in the US
  • Caterpillars Moths and butterflies raised on it Lilac-bordered Copper, White-lined Sphinx, Ruby Tiger Moth, Gem Moth 35
  • Plant eaters Animals that feed on it Brown Bear, Red-winged Blackbird, Wood Duck, Common Gallinule 44
  • Flower visitors Pollinators and other flower visitors Common Eastern Bumble Bee, Common Grass Skimmer, Pure Green Sweat Bee, Orange-legged Furrow Bee 14

Children

  • Johnston's Knotweed
  • Douglas' Knotweed

Range

United States

Greener is more native, amber more introduced; paler is less certain. How this was decided

Key traits

Layer
Herbaceous plants
Plant type
Annual Wildflower

From USDA PLANTS.

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