I. montana) is a hardy flowering rhizomatous species of the genus Iris, in the family Iridaceae.

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.

[5][6] Iris missouriensis is an erect herbaceous rhizomatous perennial, 20 to 40 centimetres (7+7⁄8 to 15+3⁄4 in) high, with leafless unbranched scapes (flowering stems) and linear basal leaves, 5 to 10 mm wide, similar in height to the scapes.

[11] The Zuni apply a poultice of chewed root to increase the strength of newborns and infants.

It is bitter and distasteful to livestock and heavy growths of the plant are a nuisance in pasture land.