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:

  • do not move firewood (ever), and
  • do not prune February through June (Texas) or April 15 through July 15 (🇺🇸 USA Midwest and East),
due to possible infestation by oak wilt disease (OWD)  Bretziella fagacearum.

Uses by native peoples
(Ethnobotany database)
  Leaves and acorns ☠︎ toxic[?] to humans, although many cultures process acorns to remove their tannins, making acorns an important staple food.

Quercus hosts caterpillars of 534 species
of butterflies and moths, in some areas.
  This plant is also known to be a host for (in areas where invasive) 🐝︎ spotted lanternfly (SLF)  Lycorma delicatula.

Interview "Our Most Essential Trees: The Nature of Oaks, with Doug Tallamy"  The joe gardener Show.  or its 🔊︎ audio

🔍︎ 🔍︎ images Discover Life Encyclopedia of Life Michigan Flora Minnesota Wildflowers Flora of North America NRCS PLANTS db Wikipedia