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 has scales you can easily rub off  or
trunk bark furrowed, has few scales you can rub off :

Trunk bark has scales you can easily rub 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, has few scales you can rub off

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.)

Part of beech / oak  family Fagaceae in bayberry / beech / birch / oak / walnut  order Fagales.

Native to the temperate and tropical areas in the Northern Hemisphere, or very close.

In many areas:

due to possible infestation by oak wilt disease (OWD)  Bretziella fagacearum.

Uses by native peoples
(Ethnobotany database)

Quercus hosts caterpillars of 534 species
of butterflies and moths, in some areas.

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