Yellow Trillium
Trillium luteum
Click or tap the section titles below to learn more about this species!
CLASSIFICATION: What’s in a name?
Scientific Name: Trillium luteum. The genus name Trillium refers to the three leaves and three petals that are characteristic of this genus. The epithet, luteum, is the Latin word for yellow.6
Common Name: Yellow Trillium. Other common names include yellow toadshade and lemon-scented trillium. One of the characteristics that can help distinguish this trillium from others is its lemony scent!3
Family: Trilliaceae (Trillium Family). Trilliums are one of eastern North America’s best-known wildflowers, and reach their greatest diversity in the Southeastern US. Virginia is home to 9 native and 3 introduced species.
IDENTIFICATION: What does it look like?
Average Height: 4-12 inches
Description: A perennial herbaceous plant with three oval leaves all arising from the top of a short aboveground stem. These smooth leaves measure about 2 ½ – 5 inches long and are mottled in different shades of green. A single flower grows from the top of the stem. The flower has 3 upright yellow petals, 3 green sepals, and 6 yellow anthers, and a greenish-white ovary. The fruit is a red capsule which splits open to release the seeds. After blooming and setting seed, the aboveground portion of the plant dies back until the next spring.9
Bloom time: Mar – May
Notes: Trillium luteum was once considered a variety of Trillium cuneatum, but now is considered a full species. As you might suspect, these two species have a lot in common! Yellow trillium (Trillium luteum) has a lemony smell, green or yellow petals, and ovaries and stamens entirely yellow when the flowers are fully open. The ovaries and stamens are at least partially dark in Little Sweet Betsy (Trillium cuneatum).7 Trillium cuneatum is native in the southeast from Kentucky to North Carolina and as far south as Georgia, and is occasionally found escaped from cultivation outside its native range.8
Look for the difference in the color of the ovaries in the photos!
LOCATION: Where is it at home?
Range: Rarely escaping from cultivation and becoming naturalized in Virginia, documented in Albemarle, Frederick, and Fairfax counties.4 Native and endemic to the Appalachian Mountains in North Carolina, Kentucky, Georgia, and Tennessee.5
Geology/Soil: Prefers moist soils over calcareous or mafic rocks (dark-colored rocks rich in magnesium and iron).9
Habitat: Typically found in rich cove forests, floodplain forests, deciduous forests, and limestone slopes. Unlike other trilliums, it may also grow on former farmland and homesites.3,5,9
CONNECTIONS: What are its relationships to other plants, animals, and humans?
Flora associations: Found with a wide variety of other forest herbs such as jack-in-the-pulpit (Arisaema triphyllum), wild ginger (Asarum canadense), spring beauty (Claytonia virginica), star chickweed (Stellaria pubera), mayapple (Podophyllum peltatum), and bloodroot (Sanguinaria canadensis), along with woody plants like spicebush (Lindera benzoin), witch-hazel (Hamamelis virginiana), ironwood (Carpinus caroliniana), red maple (Acer rubrum), boxelder (Acer negundo), tulip-tree (Liriodendron tulipifera), northern red oak (Quercus rubra), and beech (Fagus grandifolia).
Fauna associations: Bees, yellow jackets, and beetles are attracted to the flowers of Trillium luteum. Trilliums are among the species that moths such as American angle shades (Euplexia benesimils) and the black-patched clepsis moth (Clepsis melaleucana) may use as host plants.10
Trillium luteum seeds have an attached nutrient-packed ‘elaiosome’–a tasty snack pack evolved to attract ants. These treats are especially attractive to winnow ants (genus Aphaenogaster), some of the most common ants in eastern deciduous forests. While winnow ants collect Trillium seeds in order to eat the elaiosomes, the ants generally don’t remove them from the seeds until they reach their nest. Once there they commonly discard the elaiosome-stripped seeds in a ‘midden’, the ant colony’s nutrient-rich waste pile, and a perfect place for seed germination.1,2 This strategy of using ants for seed dispersal (formally known as myrmecochory) is common among many other spring ephemerals in our area, including spring beauty (Claytonia virginica), bloodroot (Sanguinaria canadensis), perfoliate bellwort (Uvularia perfoliata), and several species of violets (Viola spp.), among others.1
Human associations: No edible or medicinal uses for Trillium luteum are known. Various Indigenous people use other species of Trillium for a variety of minor ailments. Trillium luteum is sometimes planted in wildflower gardens.11
We want these plants to thrive and for everyone who gets to visit the park to enjoy them, so remember – don’t pick flowers or other parts of the plant!!
Bibliography & Definitions
1 Clark, R. 2022. Are seed-dispersing ants elaiosome-limited? An experimental test in a Connecticut forest dominated by myrmecochorous plants. Food Webs 32 (2022)
2 In Defense of Plants. Episode 166 – Ants as Seed Dispersers a.k.a. The Myrmecochory Episode! June 24, 2018.
3 Weakley, A.S., J.C. Ludwig, and J.F. Townsend. 2012. Flora of Virginia. Bland Crowder, ed. Foundation of the Flora of Virginia Project, Inc., Richmond. Fort Worth: Botanical Research Institute of Texas Press, pp. 1349-1351.
4 “Digital Atlas of the Virginia Flora | Trillium Luteum (Muhl.) Harbison.” Www.vaplantatlas.org, www.vaplantatlas.org/index.php?do=plant&plant=1142&search=Search. Accessed 12 July 2024.
5 “NatureServe Explorer 2.0.” Explorer.natureserve.org, explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.144095/Trillium_luteum. Accessed 12 July 2024.
6 “Trillium Luteum – Plant Finder.” Www.missouribotanicalgarden.org, www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=281994&isprofile=0&bt=4. Accessed 12 July 2024.
7 LeGrand, Harry, et. al. “Vascular Plants of North Carolina.” Ncparks.gov, 2019, auth1.dpr.ncparks.gov/flora/plant_list.php.
8 “North Carolina Botanical Garden.” Floraquest.org, floraquest.org/plant/show.php?id_plant=TRCU. Accessed 13 July 2024.
9 “North Carolina Botanical Garden.” Floraquest.org, floraquest.org/plant/show.php?id_plant=TRLU3. Accessed 13 July 2024.
10 “Trillium Luteum (Yellow Toadshade, Yellow Trillium) | North Carolina Extension Gardener Plant Toolbox.” Plants.ces.ncsu.edu, plants.ces.ncsu.edu/plants/trillium-luteum/. Accessed 13 July 2024.
11 “BRIT – Native American Ethnobotany Database.” Brit.org, 2024, naeb.brit.org/uses/search/?string=trillium. Accessed 15 July 2024.
Definitions:
Spring ephemeral: A perennial plant which grows early in the spring – before the trees grow leaves – to take advantage of the sunlight reaching the forest floor. In less than 2 months, the plant grows, blooms, produces seed, and then disappears from view as the leaves die back.
Myrmecochory: The formal term used for the dispersal of seeds by ants.
Mafic rocks: dark-colored rocks rich in magnesium and iron