Index / Search / Polygonum douglasii
§1 Plant — species · Polygonaceae
Polygonum douglasii Greene
vernacular Douglas' knotweed
§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
§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.
§4Montana distribution
Recorded in 34 of 56 Montana counties.
- 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
§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-2026-05-25
fetched 2026-05-25T16:28:53Z