It's actually related to an iris, with flat, fanned, strap-like leaves. The leaves in the above picture are from a day lily (really a lily) that it's growing near. See the leaves of the Blackberry Lily in another picture from August, below (and a bud).
But we had to wait until recently to see why the "blackberry" got into the name. If you notice the green seed pod in the first picture, here's what happens after a couple of months. The pod splits open, and reveals the "berry." Of course, it's not edible, or botanically a berry at all. But it looks like one!
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