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Key to Identifying Common Colorado Landscape Trees – 42

Previous Steps

1b – Alternate leaf arrangement on stem — go to 18
- 18a – Leaf simple — go to 19
  - 19b – Thornless — go to 22
    - 22e – All leaves unlobed — go to 31
      - 31d – Leaf is oval or oblong (twice as long as wide) — go to 40
        
        40a – Leaf base asymmetrical — go to 41
        
        41c – 1 main vein — go to 42

42a – Leaf 6 inches long — American Elm

42b – Leaf 3 inches long — Siberian Elm

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Colorado State Extension Master Gardeners work to enhance Coloradans’ quality of life by extending knowledge-based education to local communities, helping individuals make informed decisions about plants and fostering successful gardeners while protecting neighborhood environments.

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Colorado State University

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Key to Identifying Common Colorado Landscape Trees – 42

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