Tag Archives: Douglas’ knotweed

Douglas’ Knotweed

This gallery contains 6 photos.

Named after David Douglas (1798 – 1834), a Scot who collected botanical specimens in North America, Douglas’ knotweed (Polygonum douglasii) is a species of variable morphology having many subspecies, most of which are difficult to distinguish. Mountain knotweed is another … Continue reading

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