Distribution: Occurring chiefly east of the Cascades crest in Washington, but also known from the Puget Sound area; British Columbia to California, east to the Rocky Mountains.
Habitat: Common in vernally moist meadows, especially in sagebrush and Ponderosa pine forests.
Flowers: May-July
Origin: Native
Growth Duration: Perennial
Conservation Status: Not of concern
Pollination: Bumblebees, bees, flies, hummingbirds
Herbaceous perennials from thick rhizomes, the simple flowering stems 2-4 dm. tall, leafless.
Leaves basal, linear, 2-4 dm. long and 5-12 mm broad.
Flowers usually 2, pale to deep blue, purple-lined, subtended by a pair of involucral leaves; pedicels stout, up to 6 cm. long; perianth parts fused in a tube at the base, the tube 5-8 mm. long; sepals 3, oblanceolate, 5-6 cm. long, spreading and reflexed; petals 3, shorter and narrower than the sepals, erect; stamens 3, opposite the sepals; style branches 3, 20-25mm. long, with 2 terminal lobes about as long; stigma broad and slightly notched; ovary inferior.
Capsule 3-celled, spindle-shaped, leathery, 3-5 cm. long.
PNW Herbaria: Specimen records of Iris missouriensis in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Iris missouriensis checklist entry
OregonFlora: Iris missouriensis information
E-Flora BC: Iris missouriensis atlas page
CalPhotos: Iris missouriensis photos