Wild Blue Phlox (Phlox divaricata) growing on a steep rock ledge at Crapo Park in Burlington, Iowa

Details: 

(Top)  Canon EOS 10D,  shutter 1/180 second, aperture f19, ISO 100, Canon EF 100 mm macro lens, Canon MR-14EX ring flash.

(Bottom)  Canon EOS 10D,  shutter 1/500 second, aperture f3.5, ISO 200, Canon EF 100 mm macro lens, no 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. Plate 616, P 692.

USDA-NRCS. "Plant profile for Phlox divaricata L."  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=PHDI5 > (6 May 2005).