OAC-BIO Herbarium. University of Guelph, Canada. Year: 2012.   cc-by-nc-sa-3.0

Triadenum (Marsh St. Johnswort) is a genus of herb in the family Hypericaceae. They are native to Saint-Pierre Et Miquelon, Canada, and The Contiguous United States.

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EOL has data for 6 attributes, including:

Known occurrences, collected specimens and observations of marsh St. Johnswort. View this species on GBIF