Linked from
The 11 pages that link to Street tree, each with the reason it gives.
StreetBroader topic: Street trees provide shade and greenery in heavily paved corridors.
American elmNarrower topic: American elm’s high arching canopy made it a classic street-tree choice.
BoulevardRelated: Rows of street trees give many boulevards their characteristic edge and canopy.
PlatanusRelated: Plane trees tolerate many urban conditions and form broad, shady canopies.