A Little Out of Bounds

On Saturday, May 19, I was biking down the rail trail from Masontown.  Much to my surprise, I saw a small patch of irises growing on the edge of some swampy ground beside the trail.  I couldn't get too close, but this is what I got:

According to my old Field Guide to Wildflowers (1968 edition), it's a Blue Flag Iris (Iris versicolor).  The cool thing about this iris is that it's a native species, unlike the Yellow Iris (Iris pseudacorus).  Even cooler is that it's just a little bit -- but not too much -- out of its range.  If you look at the range map at this US Forest Service page, it shows up all around us, in Ohio, Pennsylvania, Maryland, and Virginia.  This one apparently does not strictly adhere to political boundaries.