Quercus palustris
Common name: 
Pin Oak
Swamp Spanish Oak
KWER-kus pa-LUS-tris
Native to (or naturalized in) Oregon: 
  • Broadleaf, deciduous tree, 60-75 ft (18-23 m), prominent central stem, pyramidal, descending lower branches.  Leaves alternate, simple, 7.5-15 cm long, 5-7 lobes, wide deep sinuses ("U" shaped in comparison with "C"-shaped sinuses of Q. coccinea), tips slightly lobed and bristle-like, glossy dark green; in fall foliage ranges from russet, bronze to brilliant red.   Blade tends to be "V"-shaped at attachment with petiole.  Many leaves hang on all winter.  Fruit (acorn) is small, about 1.5 cm long, the nut is enclosed only at the base by a thin, saucer-like cup; two seasons to mature.
  • Sun.  It has a shallow root system so more easily transplanted than many other oaks.  Shows iron chlorosis (yellow foliage) on alkaline soils, therefore it should only be planted on soils that are at least slightly acid.  It will tolerate wet soils (one of the swamp oaks), but is best in rich, acid, well-drained soil.  One of the fastest growing oak (as much as 15 ft (4.5 m) in 5-7 years).
  • Hardy to USDA Zone 4         Native range from Massachusetts to Delaware, west to Wisconsin and Arkansas.
  • palustris: of swamps
  • Oregon State Univ. campus: on Washington Way on the north edge of the football practice field, along railroad tracks.
Click image to enlarge
  • plant habit, winter and spring

    plant habit, winter and spring

  • branches, spring

    branches, spring

  • expanding leaves and male flowers

    expanding leaves and male flowers

  • plant habit, summer

    plant habit, summer

  • leaf


  • leaf, underside

    leaf, underside

  • leaves


  • developing fruit (acorns):1

    developing fruit (acorns):1

  • developing fruit (acorns):2

    developing fruit (acorns):2

  • mature fruit (acorns)

    mature fruit (acorns)

  • plant habit, fall

    plant habit, fall

  • leaves, fall

    leaves, fall

  • leaves, fall

    leaves, fall

  • leaf, fall

    leaf, fall

  • trunk, bark

    trunk, bark

  • winter twigs

    winter twigs