They can look and grow very similarly. Let’s look at all six types of Aspen trees: The quaking aspen is the most widespread aspen in North America. Its bark is smooth and white, and its leaves ...

Populus tremuloides, the quaking aspen of the North American continent, stands as one of the most easily recognized, most beautiful and most admired of all tree species. In order to help ...

In the Wasatch Mountains of the western US on the slopes above a spring-fed lake, there dwells a single giant organism that ...