This plant was found on Mt. Magazine near Paris, Arkansas. Elevation about 2,500 feet. The bloom has 6 petals and in elongated form. Photos showing entire plant and then the blooms and then the leaf base. Photos taken 05-08-03. Sorry for the poorly focused pics using long lens.
Flora of North America is recognizing two eastern species. http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=105373
Looks to me to be the smaller of the two (C. scilloides), and also made the suggestion based on common name (since the other one is prairie camas) -- but, yes, it should be keyed out to confirm.
Notice page I linked to mentions inter-gradation and also says they are sympatric. (Similarly, they are seeing C. quamash as consisting of multiple, often geographically distinct subspecies with their own combinations of leaf, flower and fruit characteristics).
