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Aster alpinus
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=ASAL3
Aster cordifolius (Blue Wood Aster)
http://www.illinoiswildflowers.info/woodland/plants/bl_woodaster.htm
Physical features, range, habitat, and physical characteristics. Includes a photo.
Asters:? An Overview
http://www.science.uwaterloo.ca/biology/jcsemple/asters.htm
Justification for the split of the traditional Aster into many different genera.
Some of Manitoba's Asters
http://www.naturenorth.com/fall/asters/asters3.html
Images of many species.