Few-leafed Sunflower (Helianthus occidentalis)
Few-leafed Sunflower (Helianthus occidentalis) growing in open field at Geode State Park in Iowa.

Details:  Canon EOS 10D,  shutter 1/125 second, aperture f13, ISO 400, Canon EF 100 mm macro lens, Canon MR-14EX flash on
 

Selected References:

USDA-NRCS. "Plant profile for Helianthus occidentalis." The PLANTS Database. (http://plants.usda.gov/ ). National Plant Data Center, Baton Rouge, LA 70874-4490 USA. 2004. <http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=HEOC2 > (13 Sep. 2004).