Populus nigra - Black poplar
I found Populus nigra in Longford park, this specimen is better known as populus nigra var italica - lombardy poplar. It has a defined outline and grows upright like a tower. It is always male and makes good windbreakers.
Deeply rigid bark with protruding bosses.
The leaves sprout as bright green glossy diamond shapes but becomes heart shaped later on.
They grow on long tough stalks.