Triosteum perfoliatum (Late Horse Gentian)

Plant Info
Also known as: Fever-wort, Wild Coffee
Genus:Triosteum
Family:Caprifoliaceae (Honeysuckle)
Life cycle:perennial
Origin:native
Habitat:part shade, sun; dry woods, thickets, poor rocky soil
Bloom season:May - June
Plant height:2 to 4 feet
Wetland Indicator Status:none
MN county distribution (click map to enlarge):Minnesota county distribution map
National distribution (click map to enlarge):National distribution map

Pick an image for a larger view. See the glossary for icon descriptions.

Detailed Information

Flower: Flower shape: 5-petals Flower shape: tubular Cluster type: whorled

[photo of flowers] Clusters of 2 to 6 stalkless, tubular flowers in the leaf axils. Flowers are velvety, purple brown to red, ½ to ¾ inch long. Blossoms open up and angle outward mid-tube, ending in 5 round lobes with a conspicuous light green style protruding from the tube. The yellow stamens remain recessed below the lobes. The 5 sepals are covered in fine downy hairs, long and narrow and may be longer than the flower.

Leaves and stems: Leaf attachment: opposite Leaf type: simple

[photo of leaves] Leaves  are opposite, long and broad, 4 to 9 inches long, 2 to 4 inches wide, broadly oval elliptic tapering to a sharp tip, toothless with somewhat wavy edges, the surfaces softly hairy, especially on the underside. The base narrows abruptly, joining the opposite leaf base, usually completely encompassing the stem (perfoliate). Leaf pairs are at right angles to the pair below. The stem is unbranched, covered in short, soft hairs.

Fruit: Fruit type: berry/drupe

[photo of fruit] Fruits are round to egg shaped, 1/3 to ½ inch long with the 5 long sepals arrayed from the end. The fleshy coat, turning a dull yellow orange when ripe, covers a large hard seed in the center (drupe).

Notes:

Late Horse Gentian grows in hardwood forest openings and margins along the tension zone between the drier southwestern prairie and the northeastern boreal forest, and is well adapted to both rich mesic soils and poorer gravelly ones. While lore has it that seeds were roasted and used as a coffee substitute, there is little evidence it was widely utilized in this manner and more likely the reputation simply came from the observation that the dried seeds bear a resemblance to coffee beans. A similar species is Early Horse Gentian (Triosteum aurantiacum) which has much the same flower except the green style does not extend out of the tube as far, has leaves that narrow at the base but do not encompass the stem (though this can be difficult to distinguish sometimes), and red-orange fruit. Early also has longer hairs on the stem than Late, but not dramatically so.

Please visit our sponsors

  • Wild Ones Twin Cities Chapter

Where to buy native seed and plants ↓

Map of native plant purveyors in the upper midwest

  • Itasca Ladyslipper Farm - Native orchids, container grown
  • Prairie Restorations - Bringing people together with the land
  • Shop for native seeds and plants at PrairieMoon.com!
  • Shooting Star Native Seeds - Native Prairie Grass and Wildflower Seeds
  • Morning Sky Greenery - Native Prairie Plants

More photos

Photos by K. Chayka taken in Hennepin, Washington and Dakota counties. Photos courtesy Peter M. Dziuk taken in Dakota and Hennepin counties.

Comments

Have you seen this plant in Minnesota, or have any other comments about it?

Posted by: Daryl Anne - Bluffs south of Winona
on: 2014-06-18 20:39:19

See on an old farm property that was once used as goat prairie. Was in bloom on 6/12/2014

Posted by: Jon - Grey Eagle, SE. Todd Co
on: 2014-10-06 16:43:23

I have a couple of these plants on our property. The land used to be a hay field, next to a cattle pasture. Now it is grass with black walnuts and oaks growing there. It took a while to find the name. There are berries along the stems.Is it poisonous? 10-6-14

Posted by: Mary Lynn - Maple Grove
on: 2015-10-18 12:18:36

I first noticed a healthy cluster of Triosteum perfoliatum two years ago along a trail through the Maple Grove park system. Since then the city has mowed most of it down. What is the legal status of this plant in Minnesota? 10/18/15

Posted by: K. Chayka
on: 2015-10-18 12:25:58

Mary Lynn, like most plants in MN, this has no special status. The landowner, whomever it may be, can do what they like with any population on their own land. However, they may not actually be aware of what native plants they have where, or that they are being mowed down at all. As a concerned citizen, you might contact the city Parks & Rec. and speak to someone about it.

Posted by: John - Frontenac State Park
on: 2015-10-19 08:52:06

Saw the telltale berries on this beautiful plant while on a hike at Frontenac State Park this weekend. It was very interesting how the berries came in different numbers at different levels. Some had six, five, four, or three.

Posted by: B - Northfield
on: 2015-11-08 07:44:51

Didn't know this plant but was happy to see it featured in a painting in the newest DNR Conservation Volunteer magazine to learn its name. Saw it and its yellow fruits last weekend on a walk through Greenvale Park Commmunity School's woods.

Posted by: Connie - Northern Washington County
on: 2016-09-09 22:01:30

Discovered this unusual plant as a volunteer on my woodland property in a spot where landscapers had laid in a thick wood mulch. Thanks to the UofM Extension and UofM Herbarium at Bell Museum for identification. Look forward to continued propogation of this welcome volunteer plant.

Posted by: Jeanne - Lost Valley SNA, Washington County
on: 2017-06-30 09:13:31

Delighted to find this plant, already gone to seed, on a hike at Lost Valley Scientific and Natural Area. Love the star-shaped "after-bloom." I'd never seen it before; props to Karen Schik at Friends of the Mississippi River for identifying it for me by my awkward description.

Post a comment

Note: All comments are moderated before posting to keep the riff-raff out. An email address is required, but will not be posted—it will only be used for information exchange between the 2 of us (if needed) and will never be given to a 3rd party without your express permission.

For info on subjects other than plant identification (gardening, invasive species control, edible plants, etc.), please check the links and invasive species pages for additional resources.



(required)




Note: Comments or information about plants outside of Minnesota and neighboring states may not be posted because Id like to keep the focus of this web site centered on Minnesota. Thanks for your understanding.