Index / Search / Polygonum douglasii ssp. majus
§1 Plant
Polygonum douglasii Greene ssp. majus (Meisn.) J.C. Hickman
vernacular large knotweed — subspecies · 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
· 66 counties across 5 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 66 counties across 5 states/territories.
California view state ↗ 7 N ▾
Idaho view state ↗ 14 N ▾
Nevada view state ↗ 1 N ▾
Oregon view state ↗ 22 N ▾
- Baker 41001
- Benton 41003
- Clackamas 41005
- Columbia 41009
- Curry 41015
- Douglas 41019
- Gilliam 41021
- Grant 41023
- Harney 41025
- Hood River 41027
- Jackson 41029
- Jefferson 41031
- Josephine 41033
- Klamath 41035
- Lane 41039
- Sherman 41055
- Umatilla 41059
- Union 41061
- Wallowa 41063
- Wasco 41065
- Washington 41067
- Wheeler 41069
Washington view state ↗ 22 N ▾
- Asotin 53003
- Benton 53005
- Chelan 53007
- Columbia 53013
- Douglas 53017
- Ferry 53019
- Franklin 53021
- Garfield 53023
- King 53033
- Kittitas 53037
- Klickitat 53039
- Lincoln 53043
- Okanogan 53047
- Pend Oreille 53051
- Pierce 53053
- Spokane 53063
- Stevens 53065
- Thurston 53067
- Walla Walla 53071
- Whatcom 53073
- Whitman 53075
- Yakima 53077
§5Sources & provenance
USDA PLANTS
Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.
plants.usda.gov/PODOM2 ↗GBIF Backbone
Canonical taxonomic identity, synonym resolution, cross-refs. CC0.
gbif.org/species/5651766 ↗Record version
Cached and built locally. Source version on this record:
usda-plants-mt-2026-05-26
fetched 2026-05-26T20:46:58Z