Calochortus eurycarpus

Calochortus eurycarpus (white mariposa lily) is a North American species of flowering plant in the lily family. It is native to the western United States: Montana, Idaho, eastern Oregon, western Wyoming, northeastern Nevada (Box Elder County) and southeastern Washington (Asotin County + Garfield County).

Calochortus eurycarpus is a bulb-forming perennial with straight stems up to 50 cm tall. Flowers are white or pale lavender (or rarely pink) with a conspicuous reddish-purple blotch on the inside of each petal.

Calochortus eurycarpus - Wikipedia