Clintonia uniflora aka Bride's Bonnet

Clintonia uniflora is a small perennial in the lily family. Common names include queen's cup, bead lily, and bride's bonnet. Its native range runs from southern Alaska to eastern California. It grows in cool mountain forests of western North America. These woods lie at middle elevations. The species name refers to its usual single flower. The genus name honors former New York governor DeWitt Clinton.

Plants form upright clumps with leaves close to the ground. They reach about 0.5–0.83 feet [0.15–0.25 metres] tall. Their spread reaches 1–2 feet [0.30–0.61 metres]. Each rosette holds two or three simple, oblong green leaves. The leaves look glossy and feel leathery. They can reach 0.67 feet [0.20 metres] long. Their width reaches 0.25 feet [0.08 metres]. Underground stems, called rhizomes, let the clumps spread slowly. Over time, this growth can form a low ground cover.

White flowers appear from spring into summer on short, leafless stalks. Each stalk usually carries one flower, though two may occur. Each bloom has six petals that form a star. Flowers measure less than 0.083 feet [0.025 metres] across. A single blue berry follows each flower. The fruit adds color in fall after the flowers fade. Bees visit the blooms for nectar and pollen. Flies and beetles also feed there. Some visitors, including short-tongued bees and flies, usually do not pollinate. The fruit attracts grouse, and the plant also attracts songbirds.

Grow queen's cup in partial shade or deep shade. It needs moist, acidic soil rich in organic matter. Loam suits it, and it tolerates heavy shade. Cool sites match the conditions of its native woods. Heat can cause decline once temperatures rise above 75°F. Its low growth suits woodland beds and shade gardens. It also fits naturalized areas where clumps can spread. The flowers and blue fruit both offer seasonal interest.

This slow-growing plant needs little routine upkeep in suitable conditions. Divide roots in spring or grow new plants from seed. Seed-grown plants may take four years to produce flowers. Slugs can damage the plant. ASPCA lists it as non-toxic to cats, dogs, and horses. That safety listing does not establish it as human food.