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Platanus occidentalis — American sycamore

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Facts

American sycamore is a handsome tree with a patterned white-gray bark that flakes off to reveal a green inner bark. It can attain an enormous girth, especially in its native habitats in floodplains. One tree measured by George Washington was 13 feet (3.5m) in diameter. Old sycamores often have hollow trunks, which provide shelter to flocks of chimney swifts and even denning sites for black bear. Cross-sections of fat trunks were used as early cart wheels by pioneer settlers. Sycamore is also widely planted as a majestic street tree, although it is susceptible to injury from ozone and other pollutants.

Habitat

Floodplain (river or stream floodplains), shores of rivers or lakes, swamps

New England distribution

Adapted from BONAP data

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North America distribution

Adapted from BONAP data

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Characteristics

Habitat
  • terrestrial
  • wetlands
New England state
  • Connecticut
  • Maine
  • Massachusetts
  • New Hampshire
  • Rhode Island
  • Vermont
Growth form
the plant is a tree
Leaf type
the leaf blade is simple (lobed or unlobed but not separated into leaflets)
Leaves per node
there is one leaf per node along the stem
Leaf blade edges
the edge of the leaf blade has lobes, or it has both teeth and lobes
Leaf duration
the leaves drop off in winter (or they wither but persist on the plant)
armature on plant
the plant does not have spines, prickles, or thorns
Leaf blade length
50–200 mm
Leaf blade width
50–250 mm
Leaf stalk
the leaves have leaf stalks
Fruit type (general)
the fruit is dry but does not split open when ripe
Bark texture
the bark of an adult plant peels off easily or hangs off
Twig winter color
  • brown
  • gray
  • orange
Bud scale number
there is one scale on the winter bud, and it covers the scale like a cap
Show all characteristics

  • Buds or leaf scars

    Bud position relative to scar
    the winter bud has a leaf scar partially or completely surrounding it
    Bud scale number
    there is one scale on the winter bud, and it covers the scale like a cap
    Bud scar shape (Fraxinus)
    NA
    Collateral buds
    there are no collateral buds on the sides of the branches
    Leaf scar arrangement
    there is one leaf scar per node on the stem or twig
    Superposed buds
    there are no superposed buds on the branch
    Terminal bud
    there is no terminal bud on the branch
    Winter bud distribution
    the winter buds are distributed fairly evenly along the twig
    Winter bud scale hairs
    the winter bud scales have no hairs on them
    Winter bud scales
    the winter bud is perulate (partially or completely covered with one or more scales)
    Winter bud shape
    • the winter buds are conical (cone-shaped)
    • the winter buds are ovoid (egg-shaped)
    Winter bud stalks
    the winter buds have no stalks

  • Flowers

    Enlarged sterile flowers
    there are no enlarged sterile flowers on the plant
    Flower appearance
    the flowers appear at the same time as the leaves
    Flower petal color
    NA
    Flower symmetry
    there are two or more ways to evenly divide the flower (the flower is radially symmetrical)
    Hairs on ovary (Amelanchier)
    NA
    Hypanthium present
    the flower does not have a hypanthium
    Inflorescence hairs
    there are hairs on some part of the inflorescence
    Inflorescence type
    • the flowers grow out of the axil (point where a branch or leaf is attached to the main stem)
    • the inflorescence has only one flower on it
    Number of pistils
    • 3
    • 4
    • 5
    • 6 or more
    Ovary position
    the ovary is above the point of petal and/or sepal attachment
    Petal and sepal arrangement
    the flower includes two cycles of petal- or sepal-like structures
    Petal appearance
    NA
    Petal fusion
    NA
    Sepal appearance
    the sepals resemble leaves in color and texture
    Sepal cilia (Ilex)
    NA
    Sepal tip glands
    there are no glands at the tips of the sepal lobes
    Sepals fused only to sepals
    the sepals are fused to each other (not other flower parts), at least near their bases
    Stamen number
    • 3
    • 4
    • 5
    • 6
    • 7
    • 8
    Stamen position relative to petals
    the stamens are lined up with the sepals (antesepalous)
    Stamens fused
    the stamens are not fused to one another

  • Fruits or seeds

    Berry color
    NA
    Fruit tissue origin
    there are no flower parts that form part of the fruit
    Fruit type (general)
    the fruit is dry but does not split open when ripe
    Fruit type (specific)
    • the fruit is an achene (dry, usually 1-seeded, does not separate or split open at maturity)
    • the fruit is an aggregate (composed of multiple fused ovaries from one flower)
    Nut with spines (Fagaceae)
    NA
    Wings on fruit
    there are no wings on the fruit

  • Glands or sap

    Sap color
    the sap is clear and watery
    Stalked glands on fruit (Rosa)
    NA

  • Growth form

    Growth form
    the plant is a tree

  • Leaves

    Hairs on underside of leaf blade
    the underside of the leaf has hairs on it
    Hairs on upper side of leaf blade
    the upper side of the leaf is fuzzy or hairy
    Leaf blade base shape
    • The base of the leaf blade is cordate (heart-shaped, with rounded lobes)
    • the base of the leaf blade is cuneate (wedge-shaped, tapers to the base with relatively straight, converging edges), or narrow
    • the base of the leaf blade is truncate (ends abruptly in a more or less straight line as though cut off)
    Leaf blade base symmetry
    the leaf blade base is symmetrical
    Leaf blade bloom
    the underside of the leaf has no noticeable bloom
    Leaf blade edges
    the edge of the leaf blade has lobes, or it has both teeth and lobes
    Leaf blade edges (Acer)
    NA
    Leaf blade flatness
    the leaf is flat (planar) at the edges
    Leaf blade hairs
    at least some of the hairs on the leaf blade are branched
    Leaf blade length
    50–200 mm
    Leaf blade scales
    there are no scales on the leaf blades
    Leaf blade shape
    the leaf blade is ovate (widest below the middle and broadly tapering at both ends)
    Leaf blade texture
    the leaf blade is herbaceous (has a leafy texture)
    Leaf blade translucent dots
    there are no translucent dots on the leaf blade
    Leaf blade vein pattern
    the main veins of the leaf blade are palmate (radiate out from the base, like a hand)
    Leaf blade veins
    the leaf blade has three or more main veins running from the base (or near the base) towards the tip
    Leaf blade width
    50–250 mm
    Leaf duration
    the leaves drop off in winter (or they wither but persist on the plant)
    Leaf form
    the plant is broad-leaved (with broadly flattened leaf blades)
    Leaf lobe tips (Quercus)
    NA
    Leaf midrib glands
    the midrib of the leaf blade lacks glands on the upper surface
    Leaf stalk
    the leaves have leaf stalks
    Leaf stalk attachment to leaf
    the petiole attaches at the basal margin of the leaf blade
    Leaf stalk nectaries
    there are no nectaries on the leaf stalk
    Leaf stalk shape
    the leaf stalk is not flattened
    Leaf teeth
    the leaf blade margin is serrate (with forward-pointing) or dentate (with outward-pointing) with medium-sized to coarse teeth
    Leaf teeth hairs (Carya)
    NA
    Leaf type
    the leaf blade is simple (lobed or unlobed but not separated into leaflets)
    Leaves per node
    there is one leaf per node along the stem
    Specific leaf type
    the leaves are simple (lobed or unlobed but not separated into leaflets
    Stipules
    the plant has stipules

  • Place

    Habitat
    • terrestrial
    • wetlands
    New England state
    • Connecticut
    • Maine
    • Massachusetts
    • New Hampshire
    • Rhode Island
    • Vermont
    Specific habitat
    • river or stream floodplains
    • shores of rivers or lakes
    • swamps

  • Scent

    Plant odor
    the plant does not have much of an odor, or it has an unpleasant or repellant odor

  • Stem, shoot, branch

    Aerial roots
    the plant has no aerial roots
    Bark texture
    the bark of an adult plant peels off easily or hangs off
    Branch brittleness (willows only)
    NA
    Branch cross-section
    the branch is circular in cross-section, or it has five or more sides, so that there are no sharp angles
    First-year cane (Rubus)
    NA
    Lenticels on twigs
    there are clearly lenticels on the twigs
    Short shoots
    there are peg- or knob-like shoots present
    Twig bloom
    there is no bloom on the twig
    Twig hairs
    the twigs have few or no hairs on them
    Twig papillae (Vaccinium species only)
    NA
    Twig scales
    there are no scales on the twig surface
    Twig winter color
    • brown
    • gray
    • orange
    Wings on branch
    the branch does not have wings on it
    armature on plant
    the plant does not have spines, prickles, or thorns

Wetland status

Usually occurs in wetlands, but occasionally in non-wetlands. (Wetland indicator code: FACW)

In New England

Distribution

Connecticut
present
Maine
present
Massachusetts
present
New Hampshire
present
Rhode Island
present
Vermont
present

Conservation status

Exact status definitions can vary from state to state. For details, please check with your state.

Maine
extirpated (S-rank: SX), potentially extirpated (code: PE)
Massachusetts
unranked (S-rank: SNR)

From Flora Novae Angliae dichotomous key

2.  Platanus occidentalis L. n

American sycamore. CT, MA, ME, NH, RI, VT. River shores, riparian forests, swamps. Records from northern counties in ME represent cultivated or escaped populations. It is only (and formerly) native to the southern portion of the state.

Native to North America?

Yes

Sometimes confused with

Acer pseudoplatanus:
leaves opposite and bark close, not exfoliating (vs. P. occidentalis, with leaves alternate and bark with exfoliating patches that create different colored regions on the stem).

Family

Platanaceae

Genus

Platanus