Alnus incana
PlantsFamily: Betulaceae · Genus: Alnus

Kenneth Dritz. USDA NRCS. 1995. Northeast wetland flora: Field office guide to plant species. Northeast National Technical Center, Chester, PA. Courtesy of USDA NRCS Wetland Science Institute. · public_domain
About
Alnus incana, the grey alder, tag alder or speckled alder, is a species of multi-stemmed, shrubby tree in the birch family, with a wide range across the cooler parts of the Northern Hemisphere. Tolerant of wetter soils, it can slowly spread with runners and is a common sight in swamps and wetlands.
Summary from Wikipedia
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Growing details and traits for Alnus incana in the Library.
No cultivars in the Library yet — the full profile above covers the species itself.