Related Clues:
- They form parallel lines along the National Mall
- Long-lived trees
- Thousand __: Ventura County city
- London's ___ Park, near Epsom Downs
- Marla __, former wife of Donald Trump
- Annual flat race run at Epsom for three-year-old fillies
- Durable wood sources
- Deciduous 26-Downs
- Shade trees on the National Mall
- Trees that line some streets
- They were once acorns
- Sappy types
- Illinois and Iowa's trees
- They may shade streets
- Sometimes-slippery trees