Photo: Triosteum perfoliatum.

Flowering plant. This one looks just weird. Uppsala bot. g., Sweden. Planted. 2003-06-23.
Triosteum perfoliatum L. Engl.: feverwort, bastard ipecac, horse gentian, tinker's weed. Deu.: Amerikanische Fieberwurz. Sven.: skålfeberrot
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Photo: Triosteum perfoliatum.