Douglas maple

Silhouette - Douglas maple
  • Latin name: Acer glabrum var. douglasii (Hook.) Dippel
  • French name: Érable nain
  • Synonym(s): Rocky Mountain maple
  • Taxonomic Serial Number: 183678
  • NA4 , C5
Description

Leaves

  • Deeply notched leaf form - Douglas maple
  • Leaf with detail of coarsely double-toothed margin - Douglas maple

Form

  • 3–5 lobes
  • Narrow toward base
  • Notches usually shallow, narrowing to sharp slits
  • Lower surface hairless

Length

  • 7–14 cm
  • Petiole 3–12 cm

Width

  • About as wide as long

Colour

  • Upper surface dark green
  • Lower surface greyish-green
  • Petiole often reddish

Autumn colour

  • Dull red

Margin

  • Coarsely double-toothed
  • Outer edges of teeth often curved outward  

Petiole

  • Slender

Buds

  • Lateral bud and leaf scar - Douglas maple

Form

  • Terminal bud present, blunt, smooth
  • 1 visible pair of scales

Length

  • 2–5 mm 

Colour

  • Bright red, sometimes yellow

Twigs

  • Winter twig - Douglas maple

Form

  • Slender, smooth
  • Often faintly many-sided in cross-section

Colour

  • Light green to reddish-brown or purplish

Flowers

Form

  • 5 petals in loose drooping clusters (panicles)

Width

  • About 5 mm

Colour

  • Yellowish-green

Structure

  • Mostly dioecious
  • At the end of new shoots and along the sides of the branchlets

Floral timing

  • With the unfolding leaves

Fruits

  • Fruit - Douglas maple

Form

  • Nearly parallel
  • Angle between wings less than 45°
  • Hairless
  • Seedcase strongly wrinkled, indented
  • Keys in drooping clusters
  • Mature in midsummer

Length

  • Wings 18–22 mm

Colour

  • Often rose-coloured

Autumn colour

  • Turns light brown

Structure

  • Samara
  • In joined pairs

Bark

Form

  • Thin, smooth, rough with age

Colour

  • Dark reddish-brown

Size

Height

  • To 10 m 

Diameter

  • To 25 cm

Tree form

  • Silhouette - Douglas maple

Forest-grown

Trunk

  • Short, with a few slender and sharply ascending limbs dividing into many branches

Crown

  • Irregular, uneven-topped 

Root system

  • Shallow, wide-spreading

Habitat

Site

  • Along streams and on other moist sites

Range

A western tree

Other

The typical variety of this species, A. glabrum Torr. var. glabrum (TSN 28743), a tree of the Rocky Mountains in the United States, can be found in a few localities in Alberta.

Photos
  • Douglas maple
Distribution map
Distribution map - Douglas maple
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