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 (Carya spp.)

Part of hickory/​pecan/​walnut/​butternut  family Juglandaceae.

Uses by native peoples
(Ethnobotany database)
  Carya hosts caterpillars of 213 species
of butterflies and moths, in some areas.

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