Iris prismatica
Sometimes called the Slender Blue Flag
Reid State Park
Georgetown, Maine

This plant isnative to salt, brackish, and fresh marshes, meadows and shorelines
along the Atlantic coast from Georgia to Maine.
It is listed as endangered in Maryland and Pennsylvania and threatened in Maine, New Hampshire, New York, and Tennesse. (Source: Encyclopedia of Life:
www.eol.org/pages/491651/details#conservation