Sorbus scopulina Greene × Sorbus sitchensis M. Roem.
Remarks: (putative hybrid)

Idaho: Shoshone County: Bloom Peak on Idaho/Montana state line, 6-7 airmiles ENE from Shoshone Work Camp, Coeur d'Alene National Forest. Elev. 5900 ft.
T51N R5E S21 NW
Datum: NAD 27. Uncertainty: 800 meters. Coordinate Source: TRS2LL.
Stony Belt Series rocks; open, rocky peak at subalpine zone. Assoc.: Xerophyllum tenax, Douglasia montana, Vaccinium myrtillus, Pinus albicaulis and Penstemon ellipticus. 1.5-2.5 m ht. Occasional. Growing on SW slope along Sorbus scopulina; S. sitchensis grows on NE slope at top of cirque. Phenology: Flowers.

F. D. Johnson 1629, Jun 25, 1986
With C. L. Johnson
ID, Accession: 93625, Barcode: ID053246