A rhizomatous perennial with large white flowers 4 inches across. Blooms late June to September. Found across WA to SD, south to NV, AZ, NM and TX. Desert shrub, pinyon/juniper, sagebrush, mountain brush, and ponderosa pine communities; up to 7,500 ft. elev. Best in full sun, dry soils. Excellent for xeriscape mixes, erosion control on slopes.