American sycamore (Platanus occidentalis) is easiest to recognize by its patchy, peeling bark: the upper trunk and large branches often show pale cream or white patches, while the base may remain darker and furrowed. Confirm the tree with its broad, palmately lobed leaves and round fruiting heads. It is native to much of eastern North America and commonly grows in moist bottomlands and floodplains.
Start with the bark
Look for irregular patches where the outer bark has peeled away to reveal pale inner bark. On a mature tree, this mottled contrast is often most striking on the upper trunk and large limbs. The lower trunk can be darker and deeply furrowed, so an American sycamore is not necessarily white from base to crown.
The tree itself is very large, with a broad crown. Its distinctive pale, exfoliating bark is one reason it is widely planted as a shade tree, according to the USDA Forest Service’s Silvics of North America account by O. O. Wells and R. C. Schmidtling (USDA Forest Service).
Check the leaves
American sycamore leaves are simple and alternate on the twig, with three to five broad, hand-shaped lobes and coarse teeth along their edges. They can bring maple leaves to mind, but leaf shapes vary from one leaf to another, so do not identify the tree by outline alone. The USDA Forest Service reports leaves 4 to 10 inches (10 to 25.4 cm) long, often as broad as or broader than they are long (USDA Forest Service FEIS).
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Look for round fruiting heads
The tree’s fruit is a spherical head made up of many small, seed-like fruits called achenes. The heads are about 0.8 to 2 inches (2 to 5 cm) in diameter, according to the USDA Forest Service FEIS account. They can remain attached into winter, then break apart or fall the following spring. On American sycamore, a single ball-like head on a stalk is the usual field clue.
Use twigs when leaves are gone
On a leafless twig, look at the place where a leaf stem (petiole) attaches. The petiole base encloses the bud, a useful identification feature noted by the University of Nebraska–Lincoln’s American sycamore identification resource.
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Distinguish American sycamore from London planetree
London planetree is a close relative and hybrid involving American sycamore and Oriental plane. Because the two can look alike, compare several characteristics rather than relying on bark color or one leaf.
| Clue | American sycamore | London planetree |
|---|---|---|
| Leaves | Lobes tend to be broad. | Lobes tend to be somewhat longer and narrower, often longer than wide. |
| Fruiting heads | Usually one ball-like head per stalk is the practical field expectation. | The USDA NRCS guide describes one or two heads per stalk. |
| Bark | Upper trunk and limbs often show strongly pale, patchy peeling. | Bark may be greener, according to the USDA NRCS guide. |
These are tendencies, not a definitive single-trait key. Planted hybrids may also occur beyond the native range of American sycamore. The comparison traits are described in the USDA NRCS American Sycamore plant guide.
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Consider where the tree is growing
American sycamore is native across much of the eastern United States, from the Northeast and southern Ontario west toward the Great Plains and south to Texas and the Southeast, according to USDA Forest Service accounts (Silvics of North America; FEIS species review). It is especially associated with bottomlands and alluvial soils, including floodplains, creek banks, moist coves, and lower slopes. It can also grow on uplands in parts of its range. A similar-looking tree outside this geography may be planted or may be another plane tree.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What “sycamore” means
The name “sycamore” is used for different trees in different regions. This identification applies specifically to the North American species Platanus occidentalis, also known as American planetree, buttonwood, or buttonball tree. North Carolina State University Extension lists these common names in its American sycamore profile.
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