[Knotweeds: The Genera Aconogonon, Fallopia, Persicaria and Polygonum in the Cascade Mountains of Oregon and Washington]

Fall Knotwed, Spurry Knotweed

Polygonum spergulariaeforme

Synonyms: Polygonum douglasii ssp. spergulariiforme, Polygonum spergulariaeforme

Fall Knotwed, Spurry Knotweed: Polygonum spergulariaeforme (Synonyms: Polygonum douglasii ssp. spergulariiforme, Polygonum spergulariaeforme) - Fall Knotwed, Spurry Knotweed: Polygonum spergulariaeforme (Synonyms: Polygonum douglasii ssp. spergulariiforme, Polygonum spergulariaeforme)

Fall Knotwed, Spurry Knotweed: Polygonum spergulariaeforme (Synonyms: Polygonum douglasii ssp. spergulariiforme, Polygonum spergulariaeforme)

Fall Knotwed, Spurry Knotweed: Polygonum spergulariaeforme (Synonyms: Polygonum douglasii ssp. spergulariiforme, Polygonum spergulariaeforme) - Fall Knotwed, Spurry Knotweed: Polygonum spergulariaeforme (Synonyms: Polygonum douglasii ssp. spergulariiforme, Polygonum spergulariaeforme)

Fall knotweed observed at the southwest corner of the summit of Grizzly Peak, Cascade-Siskiyou National Monument.......October 14, 2019.
Paul Slichter