Forest Preserve District of Cook County, Illinois
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The Quaking Aspen
Nature Bulletin No. 325-A   December 14, 1968
Forest Preserve District of Cook County
Richard B. Ogilvie, President
Roland F. Eisenbeis, Supt. of Conservation

THE QUAKING ASPEN
Trees have voices. The soft whispering rustle of a Quaking Aspen is much different from the sound of a cottonwood or any other tree. They have personalities too, and the leaves of each kind move in a distinctive manner. The Quaking Aspen is America' s liveliest tree . In the slightest breeze, its small round leaves tremble almost incessantly, like thousands of butterfly wings, fluttering and twinkling all over it. You will find out why if you watch the pixy dance of just one leaf: the stem, from one and one-half to three inches long, is flat, flabby, and turned at right angles with the blade of the leaf.

Quaking Aspen, also called Smalltooth or Trembling Aspen, and "popple" by lumbermen, has two other distinctions: it grows on a greater variety of sites than any other species of tree in North America and has by far the most widespread range. The Bigtooth .Aspen, also called "popple", is commonly found with it but occurs only in the northeastern quarter of the United States and in adjacent Canada. Quaking Aspen thrives on sandy soil, in wet ground and tamarack swamps, in high dry places, and from sea level to elevations above 10, 000 feet. It is common in northern Illinois, all of our Great Lakes and northeastern states, and most of Canada. It also extends from Labrador and the shores of Hudson Bay to the Yukon Valley in Alaska; south through the Rockies and Sierras into Lower California, Mexico and New Mexico; south along the Appalachians into Kentucky; and is scattered through the northern Great Plains states.

In the cut-over and burned-over forest lands of such states as Michigan, Wisconsin and Minnesota, this tree and the Largetooth Aspen make up the principal forest cover on millions of acres. They protect and improve the soil. They provide shade for the maple, pine, balsam and other species that gradually replace them because aspen do not like shade. It is a tree of sunlit openings. Popple thickets furnish excellent cover and food for game. The buds are important winter food for ruffed grouse; elk, deer and snowshoe hares chew the bark and twigs; moose and porcupines eat the twigs and foliage; beaver prefer aspen for their dams and lodges, and the inner bark, although bitter as quinine, is their favorite food.

Aspen frequently reaches 40 feet in height and diameters from 12 to 18 inches. In the southern Rockies, however, it may become 100 feet tall and three feet in diameter. In autumn the pale green foliage turns golden yellow, especially brilliant in those western mountains where the aspen provides most of their fall color. Eighty years is old for an aspen because, being very susceptible to fungous diseases, borers, tent caterpillars and heart rot, many are killed before they are 50. They are easily killed by fire but sprout vigorously from the stumps.

The trunks and branches of an aspen, except at the nearly black, roughened base of old trees, is smooth and chalky white tinged with green, marked with darker horizontal scars. The male and female flowers appear on separate trees as drooping gray catkins in early spring. The fruit is a string of light green capsules, each shaped like a little Indian club and packed with tiny brown seeds. Each seed has a little tuft of white hair and may be blown long distances but it is short- lived and will not sprout unless it soon lodges in a favorable place.

For generations, aspen was considered worthless. Now it is cut for pulp to make the best grades of paper for books and magazines. Its soft white weak wood is also used for matches, boxes, crates and, especially, excelsior. In the west it is used for cabins, fences and many other purposes.

"Tho heart of oak be e'er so stout, keep me dry and I'll see him out".


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