Index / Search / Polygonum douglasii ssp. johnstonii
§1 Plant
Polygonum douglasii Greene ssp. johnstonii (Munz) J.C. Hickman
vernacular Johnston's 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
· 100 counties across 13 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 100 counties across 13 states/territories.
Arizona view state ↗ 8 N ▾
Colorado view state ↗ 1 N ▾
Idaho view state ↗ 17 N ▾
Montana view state ↗ 4 N ▾
Nebraska view state ↗ 2 N ▾
Nevada view state ↗ 11 N ▾
New Mexico view state ↗ 7 N ▾
North Dakota view state ↗ 3 N ▾
Oregon view state ↗ 10 N ▾
South Dakota view state ↗ 2 N ▾
Utah view state ↗ 19 N ▾
Washington view state ↗ 4 N ▾
§5Sources & provenance
USDA PLANTS
Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.
plants.usda.gov/PODOJ2 ↗GBIF Backbone
Canonical taxonomic identity, synonym resolution, cross-refs. CC0.
gbif.org/species/7219337 ↗Record version
Cached and built locally. Source version on this record:
usda-plants-mt-2026-05-26
fetched 2026-05-26T14:42:51Z