Young bark=light gray, old bark=darker gray ridged or flaky;  buds=short (3-6 mm) (⅛-¼ in)

buds= pointed  or
buds= rounded :

Buds=∩ rounded

trunk bark bud scales can be rubbed off  or
trunk bark furrowed by few scales :

Trunk bark bud scales can be rubbed off

young twigs have coarse down
post oak Quercus stellata

young twigs smooth, acorns paired on long stalks
English oak Quercus robur

acorns not on stalks
white oak Quercus alba

Trunk bark furrowed by few scales

twigs=thick hairy, buds=hairy
bur oak Quercus macrocarpa

twigs=thick hairy, buds=smooth
swamp white oak Quercus bicolor

Small contorted shrubby tree

all buds=short (<3 mm) (<⅛ in)
scrub oak Quercus ilicifolia

all buds=long  (>3 mm) (>⅛ in)
blackjack oak Quercus marilandica

Learn more about oak genus Quercus (Quercus spp.)

Uses by native peoples
(Ethnobotany database)
Host to caterpillars of 452 species
of butterflies and moths, in some areas.

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