Teeth on edge of leaf many and small

Small leaf-like structures (Stipules) at the base of leaf-stem. Leaf-stem is short. Leaf has a very pointy tip. -- Black Willow

No stipules at the base of the leaf-stem.

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All trees
- Tree having broad leaves.
  - leaves simple.
    - Leaves and branches alternately arranged.
      - No thorns on branches.
        
        Only one type of leaf on tree.
        
        Leaf unlobed.
        
        Leaf has teeth on th edge.
        
        Leaf-stem is round.
        
        Leaves not heart-shaped and not very wide, but may be long.
        
        Teeth on edge of leaf many and small.

ostermiller.org (site index)

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.