Urban Tree Key
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Urban Tree Key / Leaves simple / Leaves alternate / Margin wavy / Pinnately veined / Not acorn / Deciduous / Symmetrical / Erect / Dry / Margin Flat / Not rough / Bark rough / Fruits cone-like / Alders / Egg-shaped

Alnus rubra

Red Alder

Alnus rhombifolia

White Alder

Leaves coarsely toothed, tightly rolled under at margins……….Alnus rubra

Leaves finely toothed, flat at margins……….Alnus rhombifolia

Urban Forest Ecosystems Institute
NRES Department
California Polytechnic State University
San Luis Obispo, CA 93407

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