Erythronium albidum
As the name suggests, a white Erythronium. Found across most of the eastern U.S., though I have seen it only in Arkansas and not Indiana.
Plant habit at Devil's Den State Park, northwestern Arkansas, 24 Mar 2008.
The solitary leaf from a non-flowering plant, Devil's Den State Park, Arkansas, 24 Mar 2008.
A flower, Devil's Den State Park, 24 Mar 2008.