Alnus rubra
Red alder · also Western alder, Oregon alder, Aulne rouge
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Red alder is a tall, slender deciduous broadleaf tree with grayish-white, mottled trunks and open, airy crowns of bright green foliage. It is native to western North America, primarily found near the coast and along watercourses, but also in upland forests in its northern range. Its leaves have doubly serrate edges where smaller teeth occur along the edges of larger teeth.
Where it grows
Trees in each city's inventory, with the share of that city's named trees this species accounts for.
- 4910.27%—14 in
- 1220.01%—3.0 in
- 630.18%—12 in
- 360.23%—17 in
- 120.00%34 yr16 in
- 120.02%—1.6 in
- 30.00%—3.0 in
- 20.00%—1.1 in
- 10.00%—2.0 in
- 10.00%—7.0 in
- 10.00%—2.0 in
- 10.00%——
Traits
- Form
- Broadleaf
- Foliage
- Deciduous
- Mature height
- 50–80 ft
- Canopy spread
- 30 ft
- Wildlife value
- Moderate
- Blooms
- Mar, Apr, May
Trunk diameters across every city: median 12 in, mean 14 in, 90th percentile 25 in. Measured at breast height, as published by each inventory.
Native range
Terrestrial ecoregions where this species is native. Trees in the dataset mostly stand well outside it.
Temperate Conifer Forests
- British Columbia coastal conifer forests
- North Cascades conifer forests
- Northern California coastal forests
- Northern Pacific Alaskan coastal forests
- Northern Rockies conifer forests
Boreal Forests/Taiga
- Interior Alaska-Yukon lowland taiga
Other Alnus in the catalogue
18 of the top 2,000 species are in this genus.
