"Nothoscordum bivalve - False Garlic, Crowpoison. Nothoscordum bivalve was formerly classified in the lily family, but has recently been moved to the Amaryllis family. It does not have the oniony-smell of true garlics and onions. It is classified as Rare in Indiana, and as Threatened in Ohio." - http://uswildflowers.com/detail.php?SName=Nothoscordum%20bivalve
Found a couple of patches of this in the back woods some years ago and moved to area more protected from deer. The small patch has spread substantially & now produces these lovely delicate blossoms.