Q. Can you help me ID a street tree I see planted on the 1800 block of Arch street, Philadelphia, north side?
The tree is a honey locust, Gleditsia triacanthos. See images.
Here's how we figured this out:
I searched PhillyTreeMap, which allows you to search by address. Since you weren't sure of the exact street address, I plugged in 1801 Arch Street, Philadelphia in the address box. This generated a map view of the 1800 block of Arch Street with 5 tree icons on the north side of the street, revealing 2 species, Callery pear and honey locust. Since the tree you are identifying has pinnate leaves (resembling a feather) and interesting bark, the tree is the honey locust. Honey Locusts are common street trees in Philadelphia.