Hypericum virginicum

Hypericum virginicum (Triadenum virginicum), the marsh St. Johns-wort[2] or Virginia marsh St. Johnswort,[3] is a species of flowering plant in the family Hypericaceae.[1] It is native to the central and eastern United States and eastern Canada.[1]

Hypericum virginicum
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Malpighiales
Family:	Hypericaceae
Genus:	Hypericum
Section:	Hypericum sect. Elodea
Species:	H. virginicum
Binomial name
Hypericum virginicum L.[1]
Synonyms[1]
List Androsaemum emarginatum (Lam.) K.Koch Elodes campanulata Pursh Elodes canadensis Fraser ex Spach Elodes drumondii Spach Elodes emarginata Steud. Elodes pauciflora Spach Elodes virginica (L.) Nutt. Hypericum campanulatum Walter Hypericum emarginatum Lam. Hypericum enneandrum Stokes Martia campanulata Spreng. Martia virginicum (L.) Spreng. Triadenum purpurascens Raf. Triadenum purpureum Raf. Triadenum virginicum (L.) Raf.

Hypericum virginicum is a small herbaceous plant growing up to 70 cm (28 in) in height.[4] Its leaves are sessile and opposite, sometimes clasping. The flowers grow up to 15 mm (0.6 in) in diameter, with 5 pink petals.[4] It flowers in the summer to early fall and grows in bogs, wet meadows, fens, swamps, and along lakeshores.[2][4] It can be distinguished from the closely related Hypericum fraseri by its longer, acute sepals, and longer styles.[2]

It was originally described as Hypericum virginicum L. in 1759, but long considered a member of a separate genus, Triadenum.[5][6]

• 
  Close-up of the flower
• 
  In Carroll County, New Hampshire

References

1. "Triadenum virginicum (L.) Raf". Plants of the World Online. Royal Botanical Gardens Kew. Retrieved 2019-01-02.
2. Reznicek, A. A.; Voss, E. G.; Walters, B. S., eds. (February 2011). "Triadenum virginicum". Michigan Flora Online. University of Michigan Herbarium.
3. "Triadenum virginicum". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 2 January 2019.
4. Flora of North America Editorial Committee, ed. (2015). "Triadenum virginicum". Flora of North America North of Mexico (FNA). 6. New York and Oxford. Retrieved 2 January 2019 – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
5. "Triadenum virginicum (L.) Raf". ipni.org. International Plant Names Index. Retrieved 2019-01-02.
6. "Hypericum virginicum L." ipni.org. International Plant Names Index. Retrieved 2019-01-02.