with . . .
leaflets=5 (-7), basal smaller;  twigs=thick;  mature bark=shaggy dark gray   >   shagbark hickory Carya ovata
leaflets=5 (-7), basal smaller;  twigs=thin                                  >   pignut hickory Carya glabra

leaflets=7-11;  undersurface + stems + twigs=woolly-hair        >   mockernut hickory Carya tomentosa
leaflets=7-11;  buds=yellow, leaf=large (20-30 cm)  (8-12 in)   >   bitternut hickory Carya cordiformis

leaflets=9-17;  buds=yellow, leaf=large (30-50 cm) (12-20 in)   >   pecan Carya illinoinensis

Learn more about hickory/pecan genus Carya

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Uses by native peoples
(Ethnobotany database)