Species: Botrychium hesperium

Populations are generally highly disjunct, in that most known populations are scattered and often separated by many miles (Anderson and Cariveau 2004). Farrar (2005) believes that <i>B. hesperium</i> s.s. ranges from northern Arizona in the San Francisco Peaks northward through the Rocky Mountains (including the Blue and Wallowa Mountains of Oregon) to southern British Columbia and Alberta, Yukon Territory and southeastern Alaska in the Wrangell-St. Elias Mountains. Furthermore, he notes that <i>B. </i>"<i>michiganense</i>" has been confirmed from Michigan, Minnesota and Ontario in the Lake Superior region, the Black Hills region of South Dakota and eastern Wyoming, northwestern Montana, eastern Washington, Waterton Lakes in Alberta, the Cypress Hills in Saskatchewan, and possible additional locations in the northern Rocky Mountains not yet re-identified. Subnations reporting the presence of one or both taxa include AZ, CO, ID, MI, MN, MT, OR, UT, WA, WY, AB, BC, ON, QC, SK, and YT; Anderson and Cariveau (2004) also report that <i>B</i>. "<i>michiganense</i>" specimens are known from SD, and Farrar includes AK in the range of <i>B. hesperium</i> s.s. and ND, SD, MB, and WI in the range of <i>B</i>. "<i>michiganense</i>". Total range extent (without considering any one particular area to be "disjunct") is 3,000,000+ square km.