Triadenum fraseri (Spach) Gleason

Locations ofTriadenum fraseri (Spach) Gleason in Virginia

Show image with county labels


Botanical Name
Triadenum fraseri (Spach) Gleason
Common Name
Fraser's Marsh St. John's-wort
Hypericum fraseri Spach
Flora of Virginia Name/Status
Triadenum fraseri (Spach) Gleason
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, mafic fens, seeps, seepage swamps, depression ponds and swamps; usually in peaty, nutrient-poor soils. Local and infrequent in the mountains; rare in the outer Coastal Plain.
Native Status

To save this map, right-click (control-click for Mac users) on the map and choose "Save Image As...".