Previous Steps

• 1b – Alternate leaf arrangement on stem — go to 18
  • 18a – Leaf simple — go to 19
    • 19b – Thornless — go to 22

Current Step

• 22a – Leaves extremely small (less than 1/4 inch long), almost scale-like — Salt Cedar

• 22b – Leaves fan-shaped, with smooth sides and scalloped or lobed top margin — Ginkgo

• 22c – Some leaves irregularly lobed, some not lobed at all. Milky sap at petiole base — White Mulberry

• 22d – All leaves lobed — go to 23

• 22e – All leaves unlobed — go to 31

Resources

• Identifying Broadleaf Flowering Trees and Shrubs, CMG GardenNotes #173
• List of trees in this key
• Glossary of Terms
• Front Range Tree Recommendation List
• Online CSU Extension publications on Tree and Shrub Selection