marsh thistle (Cirsium palustre) in Invasive Species Most Unwanted

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marsh thistle (<em>Cirsium palustre</em>) flower(s)

Rob Routledge, Sault College, Bugwood.org

marsh thistle (Cirsium palustre) flower(s)

marsh thistle (<em>Cirsium palustre</em>) flower(s)

Rob Routledge, Sault College, Bugwood.org

marsh thistle (Cirsium palustre) flower(s)

mid-stem showing

Rob Routledge, Sault College, Bugwood.org

mid-stem showing "Internodes (especially upper ones) with continuous or intermittent spiny wings their full length?" (quote source: Michigan Flora)

mid-stem showing

Rob Routledge, Sault College, Bugwood.org

mid-stem showing "Internodes (especially upper ones) with continuous or intermittent spiny wings their full length?" (quote source: Michigan Flora) ?

Caleb Slemmons, National Ecological Observatory Network, Bugwood.org

Caleb Slemmons, National Ecological Observatory Network, Bugwood.org