Calochortus elegans Pursh
Collected near Kamiah in Idaho Co., Idaho, on 17 May 1806. (Source)
The mariposa lily is a slender, perennial herb with deep, fleshy, onion-like bulbs. The leaves are grass like and mainly basal. Flowers are broadly cupped, about 3/4-1 5/8 inches across, with 3 wide, rounded or abruptly pointed petals, each with a distinctive gland, band of color and/or fringe of hairs near the base, borne in loose clusters of 1-5. The plant prefers light (sandy) and medium (loamy) soils and requires well-drained soil. The plant prefers acid, neutral and basic (alkaline) soils. It cannot grow in the shade. It requires dry or moist soil. Found in southeastern Washington and northeastern Oregon, Idaho Montana
Juice from the leaves were applied to pimples and the whole plant to make a medicinal tea given to women in labor to facilitate delivery of the afterbirth.