Poplar (Populus nigra Italica') [1 of 2]
There are three sorts of Poplar but this tall, elegant version is the most well known and most common. The Lombardy Poplar is not our native Poplar, the native tree is the Black Poplar bit that is now quite unusual.
The Lombardy was introduced from Italy in about 1758. There are more male trees than female tress for some reason.