Cirsium arvense

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Canada Thistle (Cirsium arvense): Several collections in Arctos, with many additional reports AKEPIC from communities throughout the region. Also a few reports from remote areas, mostly where logging activity has occurred (in particular, roads).






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  • Lamb Shephard 2007: Extremely abundant in Haines .... Less common in the rest of Southeast Alaska. Petersburg, Prince of Wales Island, Ketchikan, Wrangell, and Sitka also have infestations.... Threatens coastal meadows and riparian areas.
  • Muller: gen; intro


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