U.S.A., Montana, Glacier, About 1/4 mile E of Firebrand Pass and 5 miles SW of East Glacier, Montana.
48.391998 -113.333504
48° 24' N, 113° 21' W
1982 meters
6500 ft.
N-facing windswept slope.
On rock and soil. Abundant. Dup. ver: J.Thomson, 3/90 as X. taractica [mis-ID for North America]. Det: R. Rosentreter, 5/2010 as X. coloradoensis. Substrate: Saxicolous.