Photo: Hypericum tetrapterum 2.

Botanical name: 

Flowers. Helsinki bot.g. (Kaisan.), Finland. Planted. 2006-08-08.

Hypericum tetrapterum Fries
Engl.: square-stalked St John's-wort, St. Peter's-wort.
Deu.: Geflügeltes Johanniskraut, Flügel-Johanniskraut.
Sven.: kärrjohannesört, fyreggad johannesört.
Dan.: vinget perikon.
Fran.: millepertuis à quatre ailes.
Bot. syn.: Hypericum acutum Moench, Hypericum quadrangulum L.

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Photo: Hypericum tetrapterum 2.

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