Index / Search / Polygonum douglasii
§1 Plant
Polygonum douglasii Greene
vernacular Douglas' knotweed — species · Polygonaceae
§2Habit & range
Habit and range
- Growth habit
- Forb/herb
- Duration
- Annual
- Group
- Dicot
- Family
- Polygonaceae Juss.
- Genus
- Polygonum
Native status, by region
- CAN Canada Native
- L48 Lower 48 States Native
County-level range
· 98 counties across 12 states/territories§3Cultivation
No cultivation specs.
USDA has not characterised this taxon. Roughly four out of five plants in the database lack the detailed cultivation record present here — typically because they have not been the focus of NRCS Plant Materials work. Range and distribution data are unaffected.
§4Counties, by state
Recorded in 98 counties across 12 states/territories.
Arizona view state ↗ 9 N ▾
Maine view state ↗ 2 N ▾
Michigan view state ↗ 12 N ▾
Minnesota view state ↗ 3 N ▾
Montana view state ↗ 34 N ▾
- Beaverhead 30001
- Big Horn 30003
- Broadwater 30007
- Carbon 30009
- Cascade 30013
- Fergus 30027
- Flathead 30029
- Gallatin 30031
- Glacier 30035
- Golden Valley 30037
- Hill 30041
- Jefferson 30043
- Lake 30047
- Lewis and Clark 30049
- Lincoln 30053
- Madison 30057
- Meagher 30059
- Missoula 30063
- Musselshell 30065
- Park 30067
- Petroleum 30069
- Phillips 30071
- Pondera 30073
- Powell 30077
- Ravalli 30081
- Sanders 30089
- Stillwater 30095
- Sweet Grass 30097
- Teton 30099
- Toole 30101
- Treasure 30103
- Valley 30105
- Wheatland 30107
- Yellowstone 30111
Nebraska view state ↗ 2 N ▾
New Hampshire view state ↗ 3 N ▾
New Mexico view state ↗ 13 N ▾
New York view state ↗ 8 N ▾
North Dakota view state ↗ 3 N ▾
South Dakota view state ↗ 4 N ▾
§5Sources & provenance
USDA PLANTS
Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.
plants.usda.gov/PODO4 ↗GBIF Backbone
Canonical taxonomic identity, synonym resolution, cross-refs. CC0.
gbif.org/species/5334465 ↗Record version
Cached and built locally. Source version on this record:
usda-plants-mt-2026-05-26
fetched 2026-05-26T09:28:40Z