Works Cited

Bates, John. Trailside Botany: 101 Favorite Trees, Shrubs, and Wildflowers of the Upper           Midwest. Duluth: Pfeifer-Hamilton, 1995.

Chadde, Steve W. A Great Lakes Wetland Flora. Calumet: Pocketflora Press, 1998.

Eastman, John. The Book of Forest and Thicket: Trees, Shrubs, and Wildflowers of           Eastern North America. Harrisburg: Stackpole Books, 1992.

Levine, Carol. A Guide to Wildflowers in Winter. New Haven: Yale University Press,           1995.

Niering, William A., and Nancy C. Olmstead. National Audubon Society Field Guide to           North American Wildflowers: Eastern Region. New York: Alfred A. Knopf, 1979.

Stokes, Donald. Stokes Guide to Nature in Winter: Northeast and North Central North           America. New York: Little, Brown and Company, 1976.

Uva, Richard H., Joseph C. Neal, and Joseph M. DiTomaso. Weeds of the Northeast.           Ithaca: Cornell University Press, 1997.