Calflora Taxon Report
Polygonum douglasii  Greene  ssp. johnstonii  (Munz) J. C. Hickman

(not an active name)
Johnston's knotweed,   Knotweed
Polygonum douglasii ssp. johnstonii is an annual herb that is native to California, and also found elsewhere in western North America.
also called Polygonum sawatchense ssp. sawatchense
Siskiyou Del Norte Modoc Humboldt Shasta Lassen Trinity Plumas Tehama Butte Mendocino Glenn Sierra Yuba Lake Nevada Colusa Placer Sutter El Dorado Yolo Alpine Napa Sonoma Sacramento Mono Amador Solano Calaveras Tuolumne San Joaquin Marin Contra Costa Alameda Santa Cruz Mariposa Madera San Francisco San Mateo Merced Fresno Stanislaus Santa Clara Inyo San Benito Tulare Kings Monterey San Bernardino San Luis Obispo Kern Santa Barbara Ventura Los Angeles Riverside Orange San Diego Imperial
DJJJASONAFMM

Bloom Period
Parent: Polygonum douglasii
Genus: Polygonum
Family: Polygonaceae  
Category: angiosperm  
PLANTS group:Dicot
Jepson eFlora section: eudicot

Wetlands: Occurs usually in non wetlands, occasionally in wetlands
Name Status:
Accepted by PLANTS
Alternate Names:
PLANTSPolygonum douglasii var. johnstonii
PLANTSPolygonum sawatchense ssp. oblivium
PLANTSPolygonum sawatchense
PLANTSPolygonum triandrum
PLANTSPolygonum utahense
More …
Information about Polygonum douglasii ssp. johnstonii from other sources
Nursery availability from CNPLX
Commercial availability unknown.

USDA PLANTS Profile (PODOJ2)

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ID Tips on PlantID.net

Suggested Citation
“Calflora - Taxon Report.” The Calflora Database, a non-profit organization. .

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