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Symphyotrichum
http://2bnthewild.com/plants/H246.htm
Images and descriptions of five species of wild asters from the southeastern USA.
Symphyotrichum boreale
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=SYBO2
Northern Bog Aster.
Symphyotrichum campestre var. campestre
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=SYCAC
Western Meadow Aster.