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Key to Identifying Common Colorado Landscape Trees – 35

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
      - 31b – Leaf is round or heart-shaped — go to 35

35a – Petiole is round — go to 36

35b – Petiole is flat — Quaking Aspen

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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 – 35

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