This section is from the book "Who's Who Among The Wild Flowers", by W. I. Beecroft. Also available from Amazon: A Field Guide to Edible Wild Plants.
Blue Iris: Flower-de-luce. Iris versicolor.
Iris Family. May - July.
Found in swamps, on margins of ponds and streams. Newfoundland to Manitoba and southward.
Violet-blue, the 3 outer divisions recurved, yellow at the base, veined with purple; 1 or more flowers borne on stem 2 - 3 feet high.
Erect, sword-shaped.

Larger Blue Flag.
I. prismdtica.
Flowers smaller than those of the preceding, borne on slender stems. Leaves narrow, grass-like. Marshes near the coast. Nova Scotia to Georgia.
 
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