Rocky Mountain Iris (Iris missouriensis)

Iris missouriensis (syn. I. montana) is a hardy flowering rhizomatous species of the genus Iris, in the family Iridaceae. Its common names include western blue flag, Rocky Mountain iris, and Missouri flag. It is native to western North America. Its distribution is varied; it grows at high elevations in mountains and alpine meadows and all the way down to sea level in coastal hills. Its leaves are quite unpalatable to wildlife and livestock and the roots are poisonous to humans. Description from Calscape.