Plants of Southern New Jersey

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

Triosteum perfoliatum  L.

feverwort, horse gentian

Triosteum perfoliatum Asclepias incarnata
Triosteum perfoliatum
Photos by Renee Brecht Britton and Brown. See credits below.**

Botanical name: Triosteum perfoliatum L.
Common name: feverwort
Group: dicot
Family: Caprifoliaceae (Honeysuckle)
Growth Type: forb/herb
Duration: perennial
Origin: native
Plant height: 2' - 4'
Foliage: light green, hairless to slightly pubescent, leaves opposite, smooth to slightly undulating along margins
Flower: reddish to green to brown, 1/2"; fruit is orange, August to October
Flowering/fruiting time mid-May - late June
Habitat: well drained, open woods and thickets
Range in New Jersey: statewide but rare on the Coastal Plain
Heritage ranking if any: n/a
Misc.: Utilized by bumblebees (Bombus spp.) and Anthophorid bees (Anthophora spp.), and the caterpillars of the moth Hemaris diffinis (Snowberry Clearwing.)
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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: 572.
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