Phacelia sericea (Graham) A. Gray var. lyallii A. Gray
Annotated by Rydberg. Remarks: Catalogue of the Flora of Montana and the Yellowstone National Park. P.325.

Montana: Sweet Grass County: Lake Plateau. Elev. 10000 ft.
45.27611° N, 110.11083° W,
Datum: WGS 84. Uncertainty: 879 meters. Coordinate Source: Digital Map.
Phenology: Flowers.

P. Koch 29, Aug 1, 1897
MONT, Accession: 2859