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The Wild Blue Indigo was traditionally used as a dye. I've never read whether or not the White Indigo was used in the same manner. There are a number of varieties of Baptisia but the only ones I've seen locally are the blue & white.
Could be a Polyphemus Moth.
http://en.wikipedia.org/wiki/Antheraea_p...
Could it possibly be a Nemesia? It looks similar.
http://www.projectnoah.org/spottings/619...
http://en.wikipedia.org/wiki/Nemesia_(pl...)