| Coastal |
1‑2.5 in long, thick leathery, spiny margins; glossy green above, faint hair line in vein axils below |
Trunk grows to 3 ft thick; bark smooth gray‑brown when young, darker gray with broad ridges |
Up to 100 ft tall |
Evergreen, dense rounded crown |
Coast Live Oak (Quercus agrifolia) |
| Coastal |
2‑6 in long, 3‑7 deep lobes, finely haired underside |
Trunk 3 ft thick (up to 5 ft), bark gray and fissured |
Up to 100 ft tall |
Deciduous, alligator‑like bark; acorns mature in one year |
Oregon White Oak Oak (Quercus garryana) |
| Inland |
5‑10 cm (2‑4 in) long, round deeply lobed; matte green top, pale green underside, soft fuzz |
Bark alligator‑hide ridged; trunk up to 10 ft diameter |
Up to 98 ft tall, trunk up to 10 ft diameter |
Deciduous; acorns 2‑3 cm; masting |
Valley Oak (Quercus lobata) |
| Inland |
4‑8 in long, 6 lobes, bristle‑tipped |
Bark dark with small plates; grey bark |
30‑80 ft tall, trunk 2 ft diameter |
Acorns 2‑3 in, mature second season |
Black Oak (Quercus kelloggii) |
| Inland |
Thick leathery, 1‑3.5 in long, margins spinose or entire, fuzzy then smooth |
Bark thin ~1 in, smooth, gray‑brown, may develop small tight scales |
Up to 80 ft tall, 2 ft diameter |
Acorns 1/2‑1.5 in long, two seasons to mature; twig slender; crown may be dense shrub or tree |
Canyon Live Oak (Quercus chrysolepis) |
| Inland |
1.5‑2 in long, entire or sharply pointed teeth; flat shiny green above, yellow‑green below |
Young bark smooth gray; older rough irregularly furrowed with scaly ridges; short trunk, broad crown |
30‑75 ft tall, spread 30‑80 ft |
Acorns 1‑1.5 in, mature two seasons; male catkins 2‑3 in |
Interior Live Oak (Quercus wislizeni) |
| Inland |
1‑3 in long, wavy margins, bluish‑green upper, pale lower |
Bark light gray checkered |
≤60 ft tall, 2 ft diameter |
Acorns 0.75‑1.5 in, single season |
Blue Oak (Quercus douglasii) |
| Inland |
1.5‑3 in long, leathery, entire or few sharp teeth; dull blue‑gray above, greener below, somewhat fuzzy |
Bark gray with narrow scaly ridges, shallow furrows |
Up to 50 ft tall, short crooked trunk, large twisted limbs, sparse crown |
Acorns 1 in long with thick warty cap, mature one season |
Engelmann Oak (Quercus engelmannii) |