[Fleeceflowers and Knotweeds: The Genera Aconogonon, Bistorta, Fagopyrum, Fallopia, Persicaria and Polygonum East of the Cascades 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)](../../../../cascade/mtadams/3/buck/polygonum/douglasii/polygonumdoug1.jpg)
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)](douglasii/douglasii9a.jpg)
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)](douglasii/douglasii10b.jpg)
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)](douglasii/douglasii7b.jpg)
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)](douglasii/douglasii8a.jpg)
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.
Paul Slichter