Image of thinleaf alder
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Thinleaf Alder

Alnus incana ssp. tenuifolia (Nutt.) Breitung

1999 California Academy of Sciences   cc-by-nc-sa-3.0

They have simple, simple leaves and purple flowers. Individuals can grow to 20 feet.

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EOL has data for 72 attributes, including:

Known occurrences, collected specimens and observations of thinleaf alder. View this species on GBIF