It appears to be an iris, looks to be a beardless one, probably a
Louisiana iris that someone had planted in their yard and that got away
in a flood or by birds. Very common around SW Louisiana where I live and
I just pulled out a 33 gallon garbage bag of them along my driveway.
Here in Kentucky we have small patches of wild iris that looks similar
to the one you've pictured here. Purple is the only color I've ever
seen of this type iris and they are much smaller in size than the
varieties grown in garden's and flower beds.
I did a quick Google for Pennsylvania's wildflower site but it was a
bit more difficult to use than the Kentucky website.
Could be Blue Flag - used by the indians as food. Blue flag likes swampy
areas to grow. So that's my vote! Also, folks used to take the leaves of
the blue flag as it smells real sweet and use them as Bible markers on
Sundays as it smells good and keeps the person awake to smell it.
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