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Alnus viridis ssp. sinuata (Regel) A.& D. Löve
Mountain alder, Sitka alder
Synonyms: Alnus sinuata
USDA Symbol: ALVIS
USDA Native Status: Native to U.S.
A thicket-forming shrub, 10-15 ft. tall, with short, nearly horizontal branches forming a narrow crown. The shiny, oval, toothed leaves and catkins develop with the leaves on growth of the current season. Bark is reddish-brown, becoming gray-black.
In Alaska, Sitka Alder is a pioneer in disturbed areas, following landslides, logging, and glacial retreat. Adapted to soils too barren for other trees, this subspecies improves soil conditions by adding organic matter and nitrogen from bacteria in its root nodules. It acts as a short-lived nurse tree for Sitka Spruce, later dying when shaded by the larger conifer.
Plant CharacteristicsDuration: Perennial Habit: Shrub Leaf Retention: Deciduous Leaf Arrangement: Alternate Leaf Complexity: Simple Leaf Shape: Ovate Leaf Venation: Pinnate Leaf Margin:
Double-serrate Leaf Texture:
Papery Breeding System:
, Monoecious Inflorescence: Catkin Size Notes:
Height 20-40 feet. Leaf:
Green to yellow-green above and paler green below. Autumn Foliage:
Brown Cone 1/2 to 1 inch long. Size Class:
Bloom InformationBloom Time: Jun , Jul , Aug
AK , CA , ID , MT , OR , WA , WY Canada: AB
, BC Native Distribution:
AK to n. CA & through the Rockies to WY Native Habitat:
Moist woods; stream banks; pond margins; open, mt. slopes USDA Native Status: L48(N), AK(N), CAN(N)
Growing ConditionsWater Use: High
Light Requirement: Sun , Part Shade , Shade
Soil Moisture: Moist
CaCO3 Tolerance: Low
Soil Description: Moist soils.
Conditions Comments: Useful in erosion control. Alders fix nitrogen and thus serve as nutrient-giving pioneers in reclamation projects.
PropagationDescription: Propagated from freshly collected seeds released from the female conelets in fall.
Seed Collection: Not Available
Seed Treatment: If seeds have dried in storage, a cool-moist stratification at 41 degrees for 180 days will be necessary.
Commercially Avail: yes
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is either on display or available from the following:
Native Seed Network
- Corvallis, OR
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Record Modified: 2007-01-01
Research By: TWC Staff