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Key to Identifying Common Colorado Landscape Trees – 21   arrow

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  • 21a – Thin, sharp thorns. No glands present on petiole near the leaf base — Hawthorn

 

  • 21b – Thorns are thick, blunt at ends, almost branch-like. Very thin stipules may be present. Glands may be present on petiole near the leaf base — American Plum

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