Plants of Southern New Jersey

Citizens United to Protect the Maurice River & Its Tributaries
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Plant Profile

Triadenum virginicum (L.) Raf.  

marsh St. Johnswort

Triadenum virginicum
Triadenum virginicum
Photo by Renee Brecht Britton and Brown. See credits below.**

Botanical name: Triadenum virginicum (L.) Raf.
Common name: marsh St. Johnswort
Synonomy: Hypericum virginicum L.
Group: Dicot
Family: Clusiaceae
Growth Type: Forb/herb
Duration: Perennial
Origin: Native
Plant height: 12-18"
Foliage: opposite leaves, blue-green with a purple tint. Leaves ovate, sessile.
Flower color: pink, 5 petals
Flower size: 3/4" across
Flowering/fruiting time July to August; fruit mid-September into October
Habitat: open swamps and coastal bogs
Range in New Jersey: throughout the state
Heritage ranking if any: n/a
Distribution Triadenum virginicum distribution
Misc.: An obligate wetland species, i.e., Occurs almost always (estimated probability 99%) under natural conditions in wetlands.
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USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. Vol. 2: 537.
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