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SHOWING RECORD: 11 of 23   Sitka Alder
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image: Sitka Alder
Photograph by Raymond Gehman/Corbis
Sitka Alder
(Mountain Alder)

Alnus sinuata



First Noted by Expedition
September, 1805, on the Lolo Trail, Idaho.
 

Description
Thicket-forming shrub or small tree, often with several trunks, and with shiny yellow-green leaves, gummy when young. Height: 30 ft (9 m). Diameter: 8 in (20 cm).
 

Habitat
Along streams and lakes and in valleys.
 

Range
Southwestern and central Alaska and Yukon southeast to northwestern California and central Montana; in Alaska to alpine zone above timberline; in northwestern California to 7,000 ft (2,134 m).
 

Note
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.

Species information from enature.com
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Sitka Alder