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Andrew Sabai · Apr 30, 2026

Marsh St. Johnswort (Hypericum fraseri)

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Synonyma: Triadenum fraseri, Hypericum virginicum var.

Synonyma: Triadenum fraseri, Hypericum virginicum var. fraseri

Plant Family: Hypericaceae St. John's Wort Family

Marsh St. John’s-wort (Hypericum fraseri) is an interesting plant found in bogs and sedge meadows. It grows to a height of 30-60 cm and has oval, opposite leaves.

Fraser’s Marsh St. John’s-Wort (Hypericum fraseri) plant growing in a Northern Wisconsin bog with threeway sedge, Leatherleaf and White Beak-Rush .

Close-up of Marsh St Johnswort (Hypericum fraseri) flower
Close-up of Marsh St Johnswort (Hypericum fraseri) flower

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