Populus tremuloides is a deciduous tree native to cooler areas of North America, one of several species referred to by the common name aspen. It is commonly called white poplar, quaking aspen, trembling aspen,American aspen, Quakies, mountain or golden aspen, trembling poplar, popple.
The trees have tall trunks, up to 25 meters (82 feet) tall, with smooth pale bark, scarred with black.
Populus tremuloides is the most widely distributed tree in North America, being found from Canada to central Mexico. Like other poplars, aspens make poor fuel wood, as they dry slowly, rot quickly, and do not give off much heat.
Aspen bark contains a substance that was extracted by indigenous North Americans and European settlers of the western U.S. as a quinine substitute.