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Yellow Horse Gentian, Yellowfruit Horsegentian, Narrow-leaved Horse-gentian, Lesser Horse-gentian, Yellow Tinkers Weed - Triosteum angustifolium


Family: Caprifoliaceae - Honeysuckle family Genus Common Name: Horse Gentian Native Status: NativeDicot Perennial Herb
Triosteum angustifolium - Yellow Horse Gentian, Yellowfruit Horsegentian, Narrow-leaved Horse-gentian, Lesser Horse-gentian, Yellow Tinkers Weed. There are three species in Triosteum found in the United States, with the westernmost distribution being in Kansas. All three of these are widely distributed in the east and south. Triosteum angustifolium is a bit more of a southern species than the other two. That is exemplified by the fact that the places where it is Endangered are more northern states - Connecticut, Maryland, New Jersey, and Pennsylvania.

Found in:
AL, AR, CT, DC, DE, GA, IL, IN, KS, KY, LA, MD, MO, MS, NC, NJ, NY, OH, OK, PA, RI, TN, TX, VA, WV

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Triosteum angustifolium

Distribution of Triosteum angustifolium in the United States and Canada:
USDA Plants Distribution Map temporarily unavailable.
Blue=Native; Grey=Introduced

Map from USDA Plants Database:
USDA, NRCS. 2017. The PLANTS Database (http://plants.usda.gov, 16 Dec 2017). National Plant Data Team, Greensboro, NC 27401-4901 USA.

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Site: Blue Hole Area, Pigeon Mountain East, Walker County, GA Date: 2010-April-16Photographer: Gerald C. Williamson
Nikon D60
Tamron SP 90MM f/2.8 AF Macro
The yellow or greenish-yellow blossoms are normally solitary. They are about a half-inch long and are in the leaf axils. The corolla lobes are uneven. The stigma generally extends well outside of the corolla.
Triosteum angustifolium

Site: Blue Hole Area, Pigeon Mountain, Walker County, GA Date: 2010-April-16Photographer: Gerald C Williamson
Nikon D60
Yellow Horse Gentian can grow up to 3 feet tall in rich forests. Its leaves are opposite, with the flowers growing in the axils. The leaves are generally more than three times as long as they are wide, up to 6 inches long. The leaves help differentiate the species in Triosteum when they are not blooming - Triosteum aurantiacum leaves are less than 3 times their length and are usually more than 2 inches wide. The flower of T. aurantiacum is a reddish purple, as is that of the third species, Triosteum perfoliatum. While all the leaves of the other two species are sessile, those of the middle pairs of leaves in T. perfoliatum are joined at the base, encircling the stem - thus the “perfoliatum” species epithet.
Click on the photo for a larger image
Triosteum angustifolium

Site: Blue Hole Area, Pigeon Mountain, Walker County, GA Date: 2010-April-16Photographer: Gerald C Williamson
Nikon D60
The sepals, bracts, and leaves of Yellow Horse Gentian are hairy, with many of the hairs being glandular.
Click on the photo for a larger image
Triosteum angustifolium

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All content except USDA Plants Database map Copyright Gerald C. Williamson 2017
Photographs Copyright owned by the named photographer