Related Clues:
- Trees (prone to a disease identified in the Netherlands)
- Trees in a Eugene O'Neill title
- Endangered trees
- Many Central Park trees
- Many New Haven trees
- Shade sources on streets
- Running scared, making for trees
- Trees with many streets named after them
- They form parallel lines along the National Mall
- Long-lived trees
- Deciduous 26-Downs
- Shade trees on the National Mall
- Trees that line some streets
- They may shade streets
- Sometimes-slippery trees