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References
http://www.csdl.tamu.edu/FLORA/Wilson/homepage.htm

www.easyflowers.com

http://www.prairiesto.com/prairie.htm

Chicagowildernessmag.org/issues/summer2001/prairie.dropseed.html

Tallgrass Prairie Wildflowers
by Ladd/Oberle

www.hortpix.com