A substantial eastern disjunction of Douglas’ Knotweed (Polygonum douglasii Greene, Polygonaceae) in New Brunswick, Canada

We report an isolated population of the native annual Douglas’ Knotweed (Polygonum douglasii Greene) from a dry, south-facing outcrop of conglomerate and sandstone at Big Bluff, near Sussex Corner, New Brunswick, Canada, consisting of about 2500 plants in 2018 and 2022. This occurrence is disjunct b...

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Bibliographic Details
Published in:The Canadian Field-Naturalist
Main Authors: Blaney, Sean, Bishop, Gart, Clayden, Stephen, Goltz, James
Format: Article in Journal/Newspaper
Language:English
Published: The Ottawa Field-Naturalists' Club 2024
Subjects:
Polygonum douglasii
Douglas' Knotweed
New Brunswick
Wisconsin
Alaska
Range disjunction
Big Bluff
Canada
Greene
alaska range
Online Access:https://www.canadianfieldnaturalist.ca/index.php/cfn/article/view/3115
https://doi.org/10.22621/cfn.v137i1.3115
Description
Summary:We report an isolated population of the native annual Douglas’ Knotweed (Polygonum douglasii Greene) from a dry, south-facing outcrop of conglomerate and sandstone at Big Bluff, near Sussex Corner, New Brunswick, Canada, consisting of about 2500 plants in 2018 and 2022. This occurrence is disjunct by ~450 km from the eastern limit of the known range of Douglas’ Knotweed in southwestern Maine, USA. The nearest known occurrence in Canada is in southern Quebec, ~660 km from Big Bluff. Several lines of evidence indicate that the population in New Brunswick is native. New state records for Wisconsin and Alaska found in online data sources are also verified.

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