Scientific Name:
Acer glabrum
var.
douglasii
Pronunciation:
AY-sur GLAH-brum variety dug-LUS-ee-eye
Common Name:
Douglas maple, Rocky Mountain maple
Family Name:
Sapindaceae
Plant Type:
Tree - deciduous
Key ID Features:
Often a shrubby tree with glabrous reddish young twigs; leaves opposite, 3-5 acuminate-tipped lobes, obovate, most blades 4-14cm long x 2-12cm wide, coarsely double-toothed, dull-green with pale glabrous undersides; schizocarp ~2cm wide, thick edge of wings at 20-30 degrees, each samara 2-3cm long. Winter ID: shrub usually partially shaded to 10m tall; twigs red, glabrous; buds ovoid, opposite, ~5mm long.
Habit:
Upright
Form:
Oval - vertical
Texture:
Coarse
Mature Height:
7 - 10m
Mature Spread:
5 - 7m
Growth Rate:
Moderate
Origin:
B.C. east of Cascades, B.C. west of Cascades, U.S. - northwest, U.S. - southwest
Hardiness Rating:
Zone 5: (-29 to -23 °C)
Exposure:
Full sun, Part sun/part shade
Soil/Growing Medium:
Acidic, Well-drained
Water Use:
Wetlands
Landscape Uses:
Fall interest, Native planting, Shade tree, Small garden/space, Waterside planting, Wildlife food, Woodland margin
Additional Info:
Leaf Morphology:
Form:
Simple, Lobed
Arrangement:
Opposite
Texture/Venation:
Soft flexible, Heavily veined, Palmate venation
Surfaces:
Glabrous
Colour in Summer:
Dark-green, leaves grayish green on the underside
Colour in Fall:
Yellow, Orange, Red, Dark-red
Shapes:
Obovate
Apices:
Acuminate
Bases:
Cordate
Margins:
Double serrate, Pinnately lobed
Additional Info:
Spectacular fall colour
Inflorescence Type:
Corymb, Floriferous
Flower Morphology:
Dioecious plant
Number Of Petals:
5
Corolla Shape:
Campanulate
Ovary Position:
Superior
Colour (petals):
Not showy, Green-yellow
Flower Scent:
None
Flower Time at Peak:
Apr
Additional Info:
Emerge with leaves and are either male of female (usually dioecious)
Fruit Type:
Samara, Schizocarp
Fruit Colour:
Brown (often rose color before maturing to brown: hairless)
Fruiting Time:
Aug
Additional Info:
Showy, Seedcase strongly wrinkled, mature in midsummer, schizocarps split into samara-like mericarps after dispersal
Bark Morphology:
Showy, Smooth, Multi-stem trunk
Bark or Stem Colour:
Grey, Red, Brown
Additional Info:
bark rough with age; twigs light green to reddish brown or purple
Leaf Bud Type:
Ovoid, Valvate
Leaf Scar Shape:
Crescent shaped
Propagation:
Seed
Pest Susceptibility:
(Pest resistant, Disease resistant, Drought tolerant)
Course(s):
- HORT 2355
Location(s):
- (BHE) Boulevard by Hwy. 10 Eastend : confirm ID
- (TFL) Turf Field Lab
- (TFLW) Turf Field Lab West
- (WLG) WoodLand Garden