Blackberry Lily, an introduced species, has been added to the USWildflowers database (08/06/2012.) Scientific name is Iris domestica.  Photo below was taken in the Cedars of Lebanon State Park in Wilson County, TN on August 4, 2012.   It  is also known by the common names Leopard Flower and Leopard Lily.  Go to the Blackberry Lily detail page for more information.

Blackberry Lily, Leopard Flower, Leopard Lily – Iris domestica