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Do not confuse with similar-named sister species 🇪🇺 ♒︎ European swamp thistle Cirsium palustre.
Part of plume thistle genus Cirsium in aster / daisy / 🌻︎ sunflower family Asteraceae.
Native to 🇨🇦 Canada and 🇺🇸 USA, east of the 🗻︎ Rocky Mountains.
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🇪🇺 ♒︎ European swamp thistle Cirsium palustre