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Papilio glaucus
Never heard of the black form before, but that's really close too
http://www.butterfliesandmoths.org/speci...
pipevine swallowtail
http://www.butterfliesandmoths.org/speci...
or maybe spicebush swallowtail http://www.butterfliesandmoths.org/speci...
I don't know the ID for this beautiful butterfly... but the flower is an Echinacea.. http://en.wikipedia.org/wiki/Echinacea..