Alley Oop

A narrow space between buildings on 36th Street here in Brooklyn. It’s a case study of opportunistic invasive species: Tree-of-heaven/Ailanthus altissima, at the front left; with what I think is Siberian elm/Ulmus pumila below it. Above is Princess Tree/Paulownia tomentosa. In the back and in bloom: Japanese Knotweed/Reynoutria japonica.

This is a another look of the Siberian elm, if that’s what it is.