Shumard oak

Leaves

Form

• Base rounded
• 7–11 toothed lobes
• Separated by deep narrow notches  

Length

• 12–20 cm

Colour

• Upper surface dark shiny green
• Lower surface paler

Autumn colour

• Rich red

Margin

• Toothed

Petiole

• 5–7 cm long

Buds

Length

• 6 mm

Colour

• Very pale greyish-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

• Acorns large
• Cup shallow, saucer-shaped, enclosing about one-third of the nut
• Slightly hairy

Length

• Acorns 15–30 mm

Width

• Cup 15–30 mm

Colour

• Cup grey

Bark

Form

• Deeply furrowed

Colour

• Dark grey

Size

Height

• Medium-sized to large trees
• To 40 m

Tree form

Forest-grown

Trunk

• Buttressed

Crown

• Open, wide-spreading
• Massive branches

Habitat

Site

• On lowlands, along streams
• On poorly drained, heavy soils

Range

A few locations in southern Ontario north of Lake Erie

COSEWIC Status

Special concern