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Vanessa virginiensis
Fields, meadows, roadsides and gardens.
This is almost certainly an American Lady. Take a look at this page for a good comparison.
http://bugguide.net/node/view/71459
Okay Keith wins...I will change the ID to painted lady then till someone challenges it.
That's interesting Liam, because I've seen lots of Painted Ladies(19 just in my yard last year) and have never seen an American Lady. I agree this is an American Lady because of the white spot in the first rectangular submarginal orange cell of the front wing.
It is hard to tell with this butterfly, especially since part of the hindwing is missing. On my link, there are identification field marks. Painted Lady's show a dark "J" on the hindwing, American Lady's don't. Since this butterfly is missing the dark "J", it's an American Lady. Painted Lady's are more scarce than American Lady's in the US. I've only seen a single Painted Lady, and hundreds of American.
The butterfly looks similar to these:
http://www.genehanson.com/photos/butterf...
http://www.wildflowerfarm.com/blog/wp-co...