Home Forum Resources Shop Journey Log Back to map



intro1234567891011121314151617181920212223


Timeline
Lewis and Clark
SHOWING RECORD: 19 of 24   Western Blue-Flag
PreviousNextJournals and Maps
image: Western Blue-Flag
Photograph by Darrell Gulin/Corbis
Western Blue-Flag
(Rocky Mountain Iris)

Iris missouriensis



First Noted by Expedition
July 6, 1806, in Powell County, Montana.
 

Description
Large, delicate, pale blue or blue-violet flowers, often with purple veins, bloom at the top of stout, leafless (or with one short leaf) stalks that grow from dense clumps of flexible, tough, sword-shaped leaves. Flowers 3-4 in (7.5-10 cm) wide. Height: 8-20 in (20-50 cm).
 

Habitat
Meadows and stream banks, always where moisture is abundant until flowering time.
 

Range
British Columbia to southern California, east of the Cascade Mountains and Sierra Nevada (and on islands in Puget Sound); east to southern New Mexico, Colorado, and North and South Dakota.
 

Note
The only native species east of the Cascade Mountains and the Sierra Nevada, it often forms dense, large patches in low spots in pastures, where the tough leaves are avoided by cattle.

Species information from enature.com
ADVERTISEMENT

Subscribe Online
Your subscriptions help National Geographic conservation efforts worldwide >>



ADVERTISEMENT
Mountain Death Camas
Needle and Thread Grass
Scarlet Globe Mallow
Silvery Lupine
Snow-on-the-Mountain
Tufted Evening-Primrose
Twinberry
Western Blue-Flag
Atsina Indians
Blackfeet Indians
Crow Indians