The female flowers of a catkin from the Common Aspen (Populus tremula).

Common Aspen

The female flowers of a catkin from the Common Aspen (Populus tremula).

Also known as Populus tremula. A medium-sized tree growing up to 10-25 meters tall.

Aspen

Also known as Populus tremula. A medium-sized tree growing up to 10-25 meters tall.