Erythronium grandiflorum is a North American species of plants in the lily family.

candidum, though found in Flora of North America,[7] is considered to be a species named Erythronium idahoense.

[8] It is native to western North America from British Columbia and Alberta south to New Mexico and California, though it has not been reported from Arizona or Nevada.

[11][12][13] After hummingbirds migrate 1,500 miles each year from Mexico to the Rocky Mountains of Colorado they collect energy from the nectar of the lilies, however, rising temperatures from global warming cause the flowers to bloom, and also to wither, earlier each year.

As of 2023, the danger is foreseen that in 20 years the birds may arrive from their long migration to find their usually reliable nourishment unavailable because of premature withering.