The bark on this tree varies in colors of green-gray, grayish brown or reddish-brown and is smooth on younger plants but with a more cracked appearance on older plants. Two native American sub-species occur: Alnus incana subsp. rugosa, Speckled Adler, found in the northern US and eastern Canada, and Alnus incana subsp. tenuifolia, Thinleaf Alder found in the western US and western Canada.
- Bottomlands and swamps.
- Growth Habit:
- Up to 30 feet tall, this species may grow as a shrub or small tree with several crooked long trunks.
- Presence in US:
- AK AZ CA CO CT IA ID IL IN MA MD ME MI MN MT ND NH NJ NM NV NY OH OR PA RI UT VA VT WA WI WV WY
- Presence in Canada:
- AB BC LB MB NB NF NS NT ON PE QC SK YT