Related Clues:
- Shade sources on streets
- 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
- Trees with an American species
- Stately 110-Downs
- Central Park trees
- Shade trees at Central Park