Alnus glutinosa (black alder)

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Key Characteristics

  • Leaves are alternate, simple, round, dark green above, and doubly serrate with a rounded, slightly indented tip
  • They grow excurrently with ascending branches
  • Bark is purplish brown to gray brown
  • Twigs have stalked valvate buds and triangular pith
  • This tree is medium to large, fast growing, and rare usually seen in riparian zones in SE Michigan where they lower the water table and fix nitrogen
  • The samaras are borne on woody catkins, woody, conelike, and persistent

Sourced from a field lab in Fall 2011


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From Les Mehrhoff

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