Speckled Alder - Alnus incana ssp. rugosa
A widely-ranging northern species, Speckled Alder grows from Virginia to the northern regions of western Canada, although it is absent from the Arctic coastline. It is most common in low to mountainous elevations in wet habitat, typically alongside streams or wetlands where it often acquires a shrubby form, although it can be a small tree to 25 feet in height. It is often a colonizing species. The leaves are doubly-toothed, up to 4 inches long, dull green above and paler beneath, with a broad base. The bark is smooth with horizontal lenticels.