American Hornbeam
Carpinus caroliniana
Click or tap the section titles below to learn more about this species!
CLASSIFICATION: What’s in a name?
Scientific Name: Carpinus caroliniana. The genus name Carpinus is Latin for hornbeam, a common name used for this species and others in the genus.3 The species name, caroliniana, refers to one of the places where it’s found – the Carolinas!
Common Name: American hornbeam. Other common names include musclewood, blue beech, and ironwood. Take a look at the trunk of this tree. Can you see the reason for those common names?
Family: Betulaceae (Birch Family) This family of woody plants includes commercially important timber species like birch and alder, as well as hazelnuts! Plants in the birch family are woody plants with catkins for flowers and dry winged seeds or nuts for fruit. They have simple leaves with toothed margins that alternate along the twigs. This family is found across the Northern Hemisphere, as well as in mountainous regions of South America, but is most abundant at northern latitudes.9,10
IDENTIFICATION: What does it look like?
Average Height: 15-30 feet
Description: A small tree with one or multiple trunks with smooth gray bark and a muscular appearance. The leaves are usually 1 to 5 inches long, oval, and have sharp fine teeth on the margins and a pointed tip. The flowers are borne in catkins in early spring, and later in summer and fall, clusters of seeds dangle from the twigs resembling Chinese lanterns.
Bloom time: Mar – Apr
Notes: The foliage and fruits are similar to those of hop-hornbeam (Ostrya virginiana), a close relative. However, hop-hornbeam has shaggy, peeling bark and grows in dry, rocky woodlands and upland forests.
LOCATION: Where is it at home?
Range: Very widespread in eastern and midwestern North America, from southern Canada south to central Florida and eastern Texas, with an outlying population in Cimarron County, Oklahoma.1 In Virginia it is known from all but two counties!5
Geology/Soil: Most commonly found in rich sandy or loamy soils of bottomlands, as well as moist uplands.6
Habitat: Most strongly associated with rich moist forests and well-drained floodplain forests, but can be found occasionally in drier locations including rocky woodlands and outcrops.5,7
CONNECTIONS: What are its relationships to other plants, animals, and humans?
Flora associations: American hornbeam is an understory tree, growing in the shade of larger species like tulip-tree (Liriodendron tulipifera), bitternut hickory (Carya cordiformis), red maple (Acer rubrum), common hackberry (Celtis occidentalis), northern red oak (Quercus rubra), and sycamore (Platanus occidentalis). It is also often found with a wide array of spring-blooming wildflowers such as mayapple (Podophyllum peltatum), Virginia bluebell (Mertensia virginica), spring beauty (Claytonia virginica var. virginica), and cut-leaf toothwort (Cardamine concatenata).
Fauna associations: American hornbeam hosts a wide variety of insects, including the eastern tiger swallowtail (Papilio glaucus), walnut sphinx (Laothoe juglandus), shagreened slug moth (Apoda biguttata), pleasant dagger moth (Acronicta laetifica), skiff moth (Prolimacodes badia), and alder spittlebug (Clastoptera obtusa).4 The ruffed grouse (Bonasa umbellus) eats the catkins, and the seeds are consumed by various duck species. The wood, like that of many other riparian species, is a common choice of beavers (Castor canadensis).2
Human associations: Over the years, humans have found many uses for Carpinus caroliniana. The Chippewa used the trunks in wigwam construction, and the Cherokee and Haudenosaunee use this plant to treat diarrhea and cloudy urine.8
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 Kartesz, J.T., The Biota of North America Program (BONAP). 2015. North American Plant Atlas. (http://bonap.net/napa). Chapel Hill, N.C. [maps generated from Kartesz, J.T. 2015. Floristic Synthesis of North America, Version 1.0. Biota of North America Program (BONAP). (in press)].
2 Sullivan, Janet. 1994. Carpinus caroliniana. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.usda.gov/database/feis/plants/tree/carcar/all.html [2025, January 22].
3 “Carpinus Betulus (Common Hornbeam, European Hornbeam) | North Carolina Extension Gardener Plant Toolbox.” Ncsu.edu, 2024, plants.ces.ncsu.edu/plants/carpinus-betulus/.
4 Hilty, John. “Insect Table (Carpinus Caroliniana).” Illinoiswildflowers.info, 2025, www.illinoiswildflowers.info/trees/tables/table186.html. Accessed 22 Jan. 2025.
5 Virginia Botanical Associates. “Digital Atlas of the Virginia Flora | Carpinus Caroliniana Walt.” Vaplantatlas.org, 2025, www.vaplantatlas.org/index.php?do=plant&plant=535&search=Search. Accessed 22 Jan. 2025.
6 Weakley, A.S., and SE Flora Team. “Carpinus Caroliniana Var. Virginiana (Inland American Hornbeam) – FSUS.” Unc.edu, 2024, fsus.ncbg.unc.edu/main.php?pg=show-taxon.php&&plantname=carpinus&limit=1&offset=2&taxonid=3402. Accessed 22 Jan. 2025.
7 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
8 “BRIT – Native American Ethnobotany Database.” Brit.org, 2025, naeb.brit.org/uses/search/?string=carpinus+. Accessed 22 Jan. 2025.
9 “Birch | Tree.” Encyclopædia Britannica, 2019, www.britannica.com/plant/birch.
10 Furlow, John J. “Betulaceae – FNA.” Floranorthamerica.org, 2020, floranorthamerica.org/Betulaceae. Accessed 28 Jan. 2025.
Definitions:
Catkin: A cluster of small flowers, usually wind-pollinated, that hangs from the branches of woody plants in early spring.