[Knotweeds: The Genus Polygonum East of the Cascade Mts. of Oregon and Washington]

Douglas' Knotweed

Polygonum douglasii

Synonyms: Polygonum buxiforme var. montanum, Polygonum douglasii ssp. douglasii, Polygonum douglasii var. douglasii, Polygonum douglasii var. latifolium, Polygonum emaciatum, Polygonum montanum

Douglas' Knotweed: Polygonum douglasii (Synonyms: Polygonum buxiforme var. montanum, Polygonum douglasii ssp. douglasii, Polygonum douglasii var. douglasii, Polygonum douglasii var. latifolium, Polygonum emaciatum, Polygonum montanum)

The photo above and below show close-ups of the leaves and flowers of Douglas' knotweed as seen along road #6000 at about 2780' on the southeastern slopes of Mt. Adams..........May 29, 2005. Note that the tepals are cleft more than one-half their length.

Douglas' Knotweed: Polygonum douglasii (Synonyms: Polygonum buxiforme var. montanum, Polygonum douglasii ssp. douglasii, Polygonum douglasii var. douglasii, Polygonum douglasii var. latifolium, Polygonum emaciatum, Polygonum montanum)

Douglas' knotweed as seen along the Umatilla Rim Trail #3080 on the western slopes of High Ridge, Umatilla National Forest...........July 24, 2012.

Douglas' Knotweed: Polygonum douglasii (Synonyms: Polygonum buxiforme var. montanum, Polygonum douglasii ssp. douglasii, Polygonum douglasii var. douglasii, Polygonum douglasii var. latifolium, Polygonum emaciatum, Polygonum montanum) - Douglas' Knotweed: Polygonum douglasii (Synonyms: Polygonum buxiforme var. montanum, Polygonum douglasii ssp. douglasii, Polygonum douglasii var. douglasii, Polygonum douglasii var. latifolium, Polygonum emaciatum, Polygonum montanum)

Douglas' knotweed as seen in lithosol soils along Forest Service Road 35 on Table Mountain, Wenatchee National Forest.........June 4, 2013.

Douglas' Knotweed: Polygonum douglasii (Synonyms: Polygonum buxiforme var. montanum, Polygonum douglasii ssp. douglasii, Polygonum douglasii var. douglasii, Polygonum douglasii var. latifolium, Polygonum emaciatum, Polygonum montanum) - Douglas' Knotweed: Polygonum douglasii (Synonyms: Polygonum buxiforme var. montanum, Polygonum douglasii ssp. douglasii, Polygonum douglasii var. douglasii, Polygonum douglasii var. latifolium, Polygonum emaciatum, Polygonum montanum)

Douglas' knotweed as seen along the South Loop Road about one mile downhill from the Kiger Gorge overlook, Steens Mountain, Harney County, Oregon........September 2, 2011.

Douglas' Knotweed: Polygonum douglasii (Synonyms: Polygonum buxiforme var. montanum, Polygonum douglasii ssp. douglasii, Polygonum douglasii var. douglasii, Polygonum douglasii var. latifolium, Polygonum emaciatum, Polygonum montanum)

Douglas' knotweed as seen in moist meadows along the South Loop Road about one mile downhill from the East Rim Viewpoint, Steens Mountain, Harney County, Oregon.........September 2, 2011.

Douglas' Knotweed: Polygonum douglasii (Synonyms: Polygonum buxiforme var. montanum, Polygonum douglasii ssp. douglasii, Polygonum douglasii var. douglasii, Polygonum douglasii var. latifolium, Polygonum emaciatum, Polygonum montanum)

Paul Slichter