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Triadenum virginicum (Virginia marsh st. johnswort)
Vick, Albert F. W.

Triadenum virginicum

Triadenum virginicum (L.) Raf.

Virginia Marsh St. Johnswort

Clusiaceae (Mangosteen Family)

Synonym(s): Hypericum virginicum

USDA Symbol: TRVI2

USDA Native Status: L48 (N), CAN (N)

A marsh herb with pink flowers clustered at the top of the leafy stem and in the axils of the paired leaves.

This wetland perennial differs in flower color from most of the St. John's-worts, which are yellow. It and other St. John's-worts with similar stamen arrangements are placed by some in the genus Triadenum. The name derives from tri ("three") and aden ("gland") and refers to the three central glands. The related Lesser Marsh St. John's-wort (T. tubulosum), found only as far north as southeast Virginia, southern Indiana, and Missouri, has the base of the leaves rounded or tapered, not heart-shaped.


From the Image Gallery

2 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb
Fruit Type: Capsule
Size Notes: Up to about 28 inches tall.

Bloom Information

Bloom Color: Pink
Bloom Time: Jul , Aug , Sep , Oct
Bloom Notes: Pale pink to whitish.


USA: AL , CT , DC , DE , FL , GA , IL , IN , LA , MA , MD , ME , MI , MS , NC , NH , NJ , NY , OH , OK , PA , RI , SC , TN , TX , VA , VT , WI , WV
Canada: NS , PE
Native Distribution: Coastal, from Nova Scotia to s. New England and New York; south to Florida; local in Ohio, Indiana, and Illinois, along Great Lakes.
Native Habitat: Wet sandy areas, swamps, and bogs.

National Wetland Indicator Status

This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Triadenum virginicum in USDA Plants
FNA: Find Triadenum virginicum in the Flora of North America (if available)
Google: Search Google for Triadenum virginicum


Record Modified: 2023-03-21
Research By: TWC Staff

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