Solidago, common name goldenrod, is a perennial plant that blooms with yellow flowers August through October. It can crossbreed with other plants, and today there are at least 130 species in the United States. Several butterflies eat goldenrod nectar, including Orange Sulphur, Gray Hairstreak, American Lady and Monarch.
Source list: http://plants.usda.gov/core/profile?symbol=SOLID; http://butterflyprojectnyc.org/gardening/;
http://umm.edu/health/medical/altmed/herb/goldenrod
Concord Village EarthLab 
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