DistributionRead full entry
Range DescriptionThis species is known to occur in North America from extreme southeastern Alaska, southwestern Yukon, northern British Columbia, and western Alberta south through Washington east of the Cascades, eastern Oregon, Idaho, and western Montana to Nevada (disjunctive, Mary's, Reese, and Owyhee river systems), southwestern Idaho (disjunctive), Utah (disjunctive, Wasatch Mountains and west desert), and western and north-central (disjunctive) Wyoming (Stebbins 1985; Green et al. 1996, 1997). Disjunctive populations occur on isolated mountains and in arid-land springs. It occurs from sea level to about 3,000m asl (Stebbins 1985).