Also called marsh thistle, although do not confuse with similar-named sister species 🇪🇺 ♒︎ European swamp thistle  Cirsium palustre which is also called that.

Part of plume thistle  genus Cirsium in aster / daisy / 🌻︎ sunflower  family Asteraceae.

Native to 🇨🇦 Canada and 🇺🇸 USA, east of the 🗻︎ Rocky Mountains.

Bloom dates (NE Illinois).  Adobe Acrobat Reader file (page 2)  (🔒︎ Wild Ones members only)

Learn more about ♒︎ swamp thistle Cirsium muticum

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🏠︎ 🇪🇺 ♒︎ European swamp thistle  Cirsium palustre