Flat-Topped White Aster

Retrieved from: http://poweroftheflower.blogspot.ca/2010/10/flat-topped-white-aster.html

Jim Stasz @ USDA-NRCS PLANTS Database

USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 3: 443.