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 Appearance:
Large deciduous tree; dense canopy, 60' high when mature. Similar
to native sugar maple except: broken leaf emits milky sap; upright
green flower clusters; widely spreading winged fruit; regularly grooved
bark; fall color always yellow. Leaves:
Opposite, five-lobed, coarsely toothed,
pointed. Flower: Flat-topped
upright cluster, yellowish green, appearing with the leaves; blooming
in May. Fruit:
Widely spreading winged fruit, ripens in autumn. |
The Norway Maple invades native woodlands by
out-competing sugar maple as it is also very shade tolerant. Wildflower
diversity is reduced beneath because it forms a more dense canopy.
Although sold primarily as a boulevard tree, it spreads by seeds into
disturbed forest communities. It is native to Europe and Asia and
widely sold in nurseries in the U.S. |
 Invasive
Plants: Weeds of the Global Garden, Brooklyn Botanic Garden, Inc. |
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