Quercus douglasii

Blue oak

Distinguishing feature: Distinguishing feature: Bluish-green leaves with scalloped edges.

  • Type: Deciduous.
  • Form in maturity: Broadly rounded.
  • Leaf: Bluish-green, 1 to 1-1/2 inches long by less than an inch wide. Small star-shaped hairs on top and soft hairs on the undersides of the leaf veins. Muted pinkish-orange or yellow fall color.
  • Flower: Yellow-green tassels, occurring in early spring.
  • Bark: Thin, flaky, light gray.
  • Fruit or seed: Dark brown cone-shaped acorns, with rounded tips and a scaled cup covering up to a quarter of the nut.
  • Other: Many oak species can cross-pollinate with each other to produce a hybrid with characteristics of both of the parent species. If you have trouble identifying a particular oak tree, try to identify the nearby oak species and consider whether the tree in question may be a hybrid.

Read more about this tree at UFEI's Selectree website

Quercus-douglasii-quercus douglasii-STF trees edit
© Sacramento Tree Foundation		 Quercus-douglasii-qudoug594-OSU
© Pat Breen, OSU		 Quercus-douglasii-DF_Blue oak acorn-STF large
© Sacramento Tree Foundation