It was an unexpected thrill to see hundreds of irises punctuating the landscape north of Crater Lake in early July. Reaching heights of only 20cm (8in.), these irises made up for their lack of stature with a showy floral display. As you can tell from the leaf litter evident in the second photograph, this is a species of coniferous forests (in this case, I vaguely recall, young Pinus ponderosa).
Calphotos has additional photographs revealing the variation in flower colour of this species: Iris chrysophylla.