References
USDA-NRCS.2004. The plants Database. (http://plants.usda.gov/plants). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.

Ladd, Doug. Tallgrass Prairie Wildflowers, A Field Guide. Guilford: The Globe Pequot Press, 1995.

USDA-NRCS.2001. The Plants database,
Version 3.1 (http://plants.usda.gov). National Plant Data Center, Baton Rouge, LA 70874-4490 USA. 

Copyright. 2002-2003. By john Hilty All Rights Reserved. www.shout.net/~jhilty/plantx/pr_queenx.htm



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