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Ulmus americana |
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American Elm also
called White, Gray, Water or Swamp Elm |
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  2
to 9 |
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Newfoundland,
Canada to Florida, west to the foot of the Rockies
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United States |
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Upright, gracefully
vase-shaped, with wide-spreading branches. |
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60-80 feet tall with a spread
of 30-50 feet |
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Plants are polygamo-monoecious .
Flowers are greenish-red, not showy |
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March |
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Leaves are alternate, simple,
ovate-oblong, 3-6 inches long, with an acuminate
tip, double serrate margin and an oblique base,
coarse in texture. |
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Fall color is yellow. |
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Bark is gray, scaly, with
broad, deep, intersecting ridges, typically
displaying large, light brown, stained areas
known as
Wetwood. |
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Fruit is a samara, ˝ inch
long, maturing in late May-June. |
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Dutch elm disease (DED) wiped out a huge
percentage of American elms starting in the
1950s. Groupings and individuals still
survive...and some of them continue to die from
DED each year. |
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- 'Augustine'
- 'Delaware II' - irregular growth habit, is
resistant to DED but susceptible to Phloem necrosis .
- 'Princeton' -
vase shaped and has improved resistance to DED and the
elm leaf beetle.
- 'Washington' - classical vase shape, DED resistant but
Phloem necrosis - susceptible.
- 'Liberty' - mixture of six clones selected for DED
resistance that can be expected to have variable disease
resistance and growth habits.
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