Ladd, D. (1995). Tallgrass Prairie Wildflowers. Helena and Billings, Montana:
        The Nature Conservancy.

Duke, J.A., Foster, S. (1990). Eastern/Central Medicinal Plants. Boston, New York:
        Houghton Mifflin Company

Links
http://dnr.state.il.us/flora/prairie/table.htm

http://www.inhs.uiuc.edu/~kenr/my_home.html

http://www.earthskinnursery.com/TRAITS.htm

http://www.epa.gov/glnpo/oak/oak95/app-d.htm

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