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.
Flowers: Flat-topped upright cluster, yellowish green, appearing with the leaves, blooming in May.
Fruit: Widely spreading winged fruit, ripens in autumn.
- US Forest Service Fact Sheet
- Woody vegetation control (U of MN)
- USDA Fact Sheet
- MISIN Norwary maple identification training module
- To distinguish from Norway maple from sugar maple: Mistaken Identity - Invasive Plants and their Native Look-Alikes