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.)

Part of beech / oak  family Fagaceae.

Uses by native peoples
(Ethnobotany database)
  Quercus hosts caterpillars of 534 species
of butterflies and moths, in some areas.

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