The pith of the older part of the twig is solid

Bark breaks off into loose plates, giving the bark a shaggy appearance. Lower pair of leaflets smaller than the others. Leaf smells fragrant when crushed. -- Shagbark Hickory

Bark doesn't break off into plates.

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

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.