Key to Trees of Logan Canyon

Option 1
Do the leaves not have flattened petioles?

continue

Option 2
Do the leaves have flattened petioles or stalks? Hint: the leaves flutter in the wind and the bark is greenish-white to white. It is a quaking aspen (Populus tremuloides).

Quaking Aspen sketch

Quaking Aspen bark

Quaking Aspen leaves