Mystery iris at Isle Royale NP [1 Attachment]

 

My brother, who works for the National Park Service, spotted this iris in bloom last week along a trail at Isle Royale National Park in (very) upper Michigan. I was hoping some of you experts might have some thoughts as to what it is. 

Isle Royale did have some human settlements in the past, so it's possible it was brought in rather than being native to the area.

The foliage looks too wide for a siberian - is missouriensis or setosa a possibility? I highly doubt virginica would survive up there.

Thanks for your help,

Jean

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