A Thorny Problem

My friend Jerell took me to see an unusual tree, tucked away on West 142nd Street and (also an unusual dead-end street) Chisum Place, in Harlem...

 This is a type of locust tree, and apparently the only one of its kind in the city. With thorns like these...

 Considered dangerous because of its hard, sometimes 6 inch long thorns, the city removed any it had planted, years ago.

But one remains. Here it grows, lonely and deadly.