Lilium canadense (Liliaceae) - It is also possible that this is a "Turk's Cap Lily" (Lilium superbum). Canada lily is usually yellow, not orange, but these flower petals don't seem to re-curve as much as one might expect in a turk's cap lily... If anyone recognizes it as definitely one or the other, please feel free to email me! It blooms here (PA) in July. (Photographed in PA)