Edge of leaf has few teeth

Three (or possibly five) lobes on the leaf. Few Teeth. Leaf-stem hairy at the base (near bud). Black Maple

Five lobes. Few teeth. Leaf-stem has no hairs near bud. Sugar Maple

All Trees
- Tree having broad leaves.
  - Leaves simple.
    - Leaves and branches opposite to each other.
      - Leaves having 3 to 5 lobes.
        
        bark gray.
        
        Edge of leaf has few teeth.

This key was developed by "bt" in June 1982. It was put into HTML format by Stephen Ostermiller in July 1997. Copies of the entire guide in zip format that may be taken to camp on a laptop are available to those who write.