Common Blue Violet (Viola sororia) growing on a shaded lawn in a residential yard (top) and on a wooded hill at Geode State Park (bottom).

Details: 

(Top) Canon EOS 10D,  shutter 1/90 second, aperture f11, ISO 200, Canon EF 100 mm macro lens, Canon MR-14EX ring flash.

(Bottom) Canon EOS 10D,  shutter 1/180 second, aperture f11, ISO 100, Canon EF 100 mm macro lens, Canon MR-14EX ring flash.

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. Plates 563, 625, P 821.

USDA-NRCS. "Plant profile for Viola sororia Willd."  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=VISO > (13 June2005).