Pin oak

Silhouette - pin oak
  • Latin name: Quercus palustris Muenchh.
  • French name: Chêne des marais
  • Synonym(s): Swamp oak
  • Taxonomic Serial Number: 19281
  • NA4 , C4
Description

Leaves

  • Leaf - pin oak

Form

  • Base wedge-shaped
  • 5–7 lobes
  • Wide-spreading, separated by deep, wide, U-shaped notches
  • Upper edge of lobes at right angles to the midvein
  • Basal lobes often recurved
  • A few tufts of hairs in the vein axils

Length

  • 7–15 cm
  • Central lobe 3 times as long as the width of the leaf between opposite notches
  • Petiole 2-5 cm

Colour

  • Upper surface shiny dark green
  • Lower surface paler

Margin

  • A few bristle-tipped teeth on the larger lobes

Petiole

  • Slender

Buds

  • Lateral bud and leaf scar - pin oak

Form

  • Terminal bud ovoid, small, sharp-pointed
  • Almost hairless

Length

  • 2–4 mm

Colour

  • Light chestnut-brown

Twigs

  • Winter twig - pin oak

Form

  • Slender, hairless

Color

  • Reddish-brown

Flowers

Form

  • Pollen flowers small
  • In many-flowered drooping catkins
  • Seed flowers small
  • Solitary or in few-flowered clusters (spikes)

Structure

  • Monoecious

Floral timing

  • With the leaves

Fruits

  • Acorn - pin oak

Form

  • Acorns small
  • Short-beaked at the tip
  • Cup shallow, saucer-shaped, enclosing one-quarter of the nut
  • Scales tight-fitting, thin
  • Pointed, hairy

Length

  • Acorns 9–13 mm

Width

  • Acorns almost as wide as long
  • Cup 12–16 mm

Colour

  • Cup reddish-brown

Structure

  • 1-seeded nut

Bark

Form

  • Thin and smooth when young
  • Divides into narrow inconspicuous ridges with age

Colour

  • Greyish-brown
  • Inner bark reddish

Wood

Colour

  • Light brown

Size

Height

  • To 20 m

Diameter

  • To 60 cm

Maximum age

  • 100 years

Tree form

  • Silhouette - pin oak

Forest-grown

Trunk

  • Straight, with a gradual taper
  • Distinct well into the crown
  • Small, stiff, dead branchlets often project from the trunk and larger branches

Crown

  • Principal branches slender
  • Ascending in the upper crown
  • Horizontal in the centre of the crown
  • Curving downward in the lower crown

Root system

  • Shallow

Habitat

Site

  • Mainly on poorly drained soils
  • In swamps and along streams
  • On well-drained loamy soils
  • Frequently planted as an ornamental
  • Tolerant of urban conditions

Light tolerance

  • Intolerant of shade

Associated species

  • Mixed with other oaks, elms, and willows

Range

Southern Ontario at the east and west ends of Lake Erie
Locally abundant

Photos
  • Pin oak
  • Pin oak
Distribution map
Distribution map - pin oak
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