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Pieris rapae
Perhaps a Grass Yellow or Sulfur Yellow?
Backyard garden
Also called a Small White butterfly.
Ha ha, and grass yellows, sulfur yellows and some oranges mixed in there too. (-:
There are yellow Whites and white Yellows and large Small Whites and small Large Whites ;-)
Pieridae, Pierinae, Pierini, Pierina, Pieris rapae.
http://bugguide.net/node/view/3259/bgima...