Northern pin oak

Leaves

Form

• Lobes often constricted toward the base

Length

• 7–12 cm

Petiole

• Slender
• 3.5–5 cm long

Buds

Length

• Terminal bud 4–6 mm

Twigs

Form

• Hairy when young

Colour

• Bright 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

Form

• Cup enclosing one-third to one-half of the nut
• Tapering to a stalk-like base

Length

• Acorns 12–18 mm

Width

• Cup 10–15 mm

Bark

Form

• Shallowly furrowed, with narrow vertical plates

Colour

• Inner bark light yellow

Habitat

Site

• Sandy soils in open, disturbed habitats
• Resembles pin oak, but more likely to occur on upland sites

Range

Uncommon in Canada
Ontario west of Lake Superior and north of Lake Erie