Prairie Rose (Rosa arkansana or Rosa Pratincola) found in a field at Big Hollow Recreation Area in Des Moines County, Iowa. This is the official state flower of Iowa.

Details: 

Canon EOS 10D,  shutter 1/180second, aperture f11, ISO 200, Canon EF 100 mm macro lens.

Selected References:

Thieret John W, Niering William A, and Olmstead Nancy C. National Audubon Society Field Guide to North American Wildflowers, Eastern Region. New York: Alfred A. Knopf, Inc. Plate 457, P 754.

USDA-NRCS. "Plant profile for Rosa arkansana."  The PLANTS Database (http://plants.usda.gov/ ). National Plant Data Center, Baton Rouge, LA 70874-4490 USA. 2004. <  http://plants.usda.gov/cgi_bin/topics.cgi?earl=plant_profile.cgi&symbol=ROAR3 > (26 June 2005).