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Montana Field Guide

Montana Field Guides

Speckled Alder - Alnus incana
Other Names:  Alnus tenuifolia

Global Rank: G5
State Rank: S4S5

Agency Status
MNPS Threat Rank:
C-value: 6

External Links

General Description
Shrubs to 4 m high with grayish-brown bark. Twigs finely pubescent with blunt or rounded winter buds. Leaf blades 3–8 cm long with doubly serrate margins, paler, pubescent on veins below. Inflorescence borne on twigs of previous season. Female catkins 1–2 cm at maturity. Fruit a nutlet without wing margins.

In MT we have subspecies tenuifolia (Nutt.) Breitung (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
In MT in the western and central counties; AK to SK south to CA, east to CO, WY and NM (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: 177

(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)


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Citation for data on this website:
Speckled Alder — Alnus incana.  Montana Field Guide.  .  Retrieved on , from