Triadenum virginicum (L.) Raf.

Locations ofTriadenum virginicum (L.) Raf. in Virginia

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Botanical Name
Triadenum virginicum (L.) Raf.
Common Name
Virginia Marsh St. John's-wort, Common Marsh St. John's-wort
Hypericum virginicum L.
Flora of Virginia Name/Status
Triadenum virginicum (L.) Raf.
The proper disposition of plants in the genus Triadenum may be still unresolved, as they have been recently treated in both Hypericum and Triadenum. Based on a comprehensive phylogenetic study of Hypericum (sensu lato), Nürk et al. (2013, Molec. Phylogen. & Evol. 66: 1-16) included Triadenum in Hypericum, but the position of Triadenum as a somewhat basal clade and the inclusion of Triadenum japonicum suggests that the fairly ancient, eastern North American - east Asian vicariance had elements that were clearly similar to one another and distinct from other Hypericums long ago. The morphological distinctions of Triadenum lend further credence to its treatment as a separate genus.
Bogs, fens, wet clearings, seepage swamps, depression ponds and swamps, interdune swales and ponds, tidal swamps, and fresh to oligohaline wind-tidal marshes; usually in peaty, nutrient-poor soils. Frequent in the Coastal Plain; infrequent to rare in the outer Piedmont and mountains.
Native Status

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