Fallen leaves are avidly taken by deer in fall and early winter. It is an important food supply and building material for beavers. The leaf is … This fast-growing small to medium sized tree is affected by a plethora of disease pathogens. The two are easily distinguished by their leaves. The leaves of the quaking aspen are eaten by snowshoe hare, deer and elk. Individual quaking aspen … There are two species of aspen in North America and both of them live in eastern Iowa. The quaking leaf is often quite round with nearly smooth edges and the bigtooth leaf is more elongate with somewhat jagged edges. Quaking aspen (Populus tremuloides) are lovely in the wild, and enjoy the most extensive native range of any tree on the continent.Their leaves have flattened petioles, so they tremble in every … In the western states – the more arid parts of its range – quaking aspen … The lifespan of quaking aspens is unique. The synchrony continues in spring when the trees gain flowers and regrow leaves. In fact, Colorado State University Cooperative Extension agents claim that quaking aspen … Grouse … If any tree has a right to be a hypochondriac it is the quaking aspen (Populus tremuloides). Quaking Aspen Twig - Photo by Paul Wray, Iowa State University Aspen leaves are simple, alternate, nearly round in outline, 2 to 3 inches in diameter with a flattened petiole 2 to 3 inches long. For starters, all trees of the same clone will change leaf color at the same time in the fall.