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Black knotweed

Black knotweed is a species of flowering plant in the knotweed family known by the common names dune knotweed, black knotweed, and beach knotweed.   It is native to the coastline of western North America from British Columbia to California, where it grows in sandy coastal habitat such as beaches, dunes, and scrub.

Location
​Fairbarns, 2007 (below) describes the location as 
shoreline from Island View Beach Regional Park through Tsawout Indian Reserve to north tip of Cordova Spit Municipal Park.  See page 22

Occurence & protection
Fairbarns 2007, said at page 22 "The occurrence itself is in excellent condition.  ........... The plants are of high vigour and reproducing abundantly."
and at page 14, he said:  "No specific actions are proposed for the conservation of .....American glehnia, Beach bindweed, Black knotweed or Yellow sand-verbena."
See Fairbarns 2007 here

​
Following is a map of the location taken from the Cordova Conservation Strategy  
See here
Picture


Following is the Fairbarns 2007 assessment at page 22  See here
Picture


References
https://en.wikipedia.org/wiki/Polygonum_paronychia

http://linnet.geog.ubc.ca/Atlas/Atlas.aspx?sciname=Polygonum%20paronychia

http://nativeplants.evergreen.ca/search/view-plant.php?ID=04588