Chambered Pith

Pith dark. 11 - 17 leaflets. The end leaflet is abouit the same size as the side ones. Butternut

Pith white. 15 - 17 Leaflets. The end leaflet is smaller than the side leaflets or it is missing. Black Walnut

All Trees
- Tree having broad leaves.
  - Leaves compound.
    - Leaves and branches arranged alternately.
      - No thorns at the base of the leaf.
        
        The pith is chambered.

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.