Details: 

Canon EOS 10D,  shutter 1/250second, aperture f13, ISO 400, Canon EF 100 mm macro lens.

Selected References:

USDA-NRCS. "Plant profile for Ipomoea lacunosa 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=IPLA  > (13 Sep. 2005).