* Leaves opposite, with 5
sharply pointed lobes, dark green, with hairs in vein axils on leaf undersides,
turning yellow in autumn, 4-7". Leaf shape very similar to sugar maple
but more ornate.
* Milky sap when leaf is broken off of stem at the petiole.
This sap is not found in sugar maple leaves and distinguishes the two
* Bark grayish, with vertical ridges and shallow furrows.
* Flowers greenish yellow.
* Fruits 2-winged, like all maples. Wings wide, 1 1/2-2", nearly horizontal.
* Height: 40-50'.
* Flowers in April, before leaves come out.
* Fruits September - October.
* Habitat: Usually planted as an ornamental tree, occasionally spreading
to forests, meadows and hedgerows.
* Range: Southeastern Canada and eastern United States.
* Introduced from Europe; originally from Norway.
* On the trunks of many Norway maples, 'frost cracks' are apparent. The
cracks occur on the south side of the trunk. The bark is warmed by
the sun and then contracts in sudden temperature drops such as frosts,
cracking in the process. Norway maple bark is a living example of the
frost heaves that plague our roads in early spring!
* Norway maple provides very deep shade that reduces the growth
of native wildflowers and seedling trees. Our native species
- sugar maple - should be encouraged to grow.