light purple iris
Photo Credit
Courtesy of Veronica Wagner, North Central College.

Blue Flag Iris

Scientific name
Iris versicolor
Also Known As
Harlequin blueflag, Larger blueflag, Northern blueflag, poison flag
Plant Family
Plant Group
This wildflower blooms violet flowers in May, June, and July, and is known to attract butterflies and hummingbirds. When the flowers are not present, this wildflower has distinctly narrow, wide, long leaves that end in a point.
Identification Hints

Blue flag spreads via rhizomes in wet prairies forming clumps.  Leaves are folded, forming a flat fan.  After blooming, it forms a distinctive seed capsule.

Did You Know?

Hummingbirds are attracted to the blue flag iris.  The rhizomes are toxic to livestock, hence the alternate name of "poison flag."

States
CT, DE, ID, IL, MA, MD, ME, MI, MN, NH, OH, WI