Triadenum virginicum (L.) Raf.
Common Name: MARSH ST. JOHN'S-WORT
Coefficient of Conservatism: 10
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb

Sphagnum bogs, lake shores, old interdunal swales, wet meadows. A species of Coastal Plain affinity, disjunct to southern Michigan, northwestern Indiana, central Wisconsin, and other areas known for such plants.

The sepals are narrowly oblong to lanceolate, tapering to a more acute apex compared to the more elliptic, rounded sepals typical of T. fraseri. Plants intermediate between the two species are occasionally found.

Locations

Allegan County
Barry County
Berrien County
Calhoun County
Cass County
Ingham County
Kalamazoo County
Kent County
Lenawee County
Livingston County
Montcalm County
Muskegon County
Van Buren County
Washtenaw County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 11, 2017. http://www.michiganflora.net/species.aspx?id=1470.