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Montana Field Guide

Montana Field Guides

Green Alder - Alnus viridis
Other Names:  Alnus crispa ssp. sinuata, Alnus sinuata

Native Species

Global Rank: G5
State Rank: S5

Agency Status
MNPS Threat Rank:
C-value: 6

External Links

General Description
Shrubs to 3 m high with grayish bark, the stems often sprawling. Twigs with sharp-pointed winter buds. Leaf blades 3–10 cm long, lower surface slightly paler than above, the margins 1- to 2-times serrate. Inflorescence borne on twigs of the season. Female catkins 8–15 mm at maturity. Fruit with wings at least half as wide as nutlet (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range


Range Comments
Western and central mountains in MT; in North America our subspecies sinuata occurs from AK and YK south through BC and AB to CA, ID and MT (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX; Furlow 1997 in Fl. N. Amer. Vol. 3).

Observations in Montana Natural Heritage Program Database
Number of Observations: 3014

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Avalanche slopes, cool wet forest, often along streams; montane, subalpine (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

  • Additional ReferencesLegend:   View Online Publication
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    • Johnson, T. W. 1982. An analysis of pack and saddle stock grazing areas in the Bob Marshall Wilderness. M.Sc.Thesis. Bozeman, MT: Montana State University. 105 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Little, E.L., Jr. 1979. Checklist of United States trees (native and naturalized). Agriculture Handbook No. 541. U.S. Forest Service, Washington, D.C. 375 pp.
    • Martin, S.A. 1985. Ecology of the Rock Creek bighorn sheep herd, Beartooth Mountains, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 152 p.
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Citation for data on this website:
Green Alder — Alnus viridis.  Montana Field Guide.  .  Retrieved on , from