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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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.