The thin, firm leaves of the quaking aspen are described as being round to broadly egg-shaped; they are generally 1.5 to 3 inches long and about the same in diameter. The edges of the leaves are finely toothed. The leaves, are yellow to blue-green above, and lighter green below. As they shimmer in the wind, the bi-color nature of the leaves often makes them appear silver. In fall, the leaves of quaking aspen turn bright yellow or orange, often adding the only dash of brilliant color to the otherwise green landscape.