Calochortus dunnii is a rare species of flowering plant in the lily family known by the common name Dunn's Mariposa lily.
The plant is endemic to the Peninsular Ranges, native to southern San Diego County, California; and northern Baja California state, Mexico. It is known from only a few occurrences in chaparral, grassland, and Closed-cone coniferous forest habitats, at 185–1,830 feet (56–558 m) in elevation in the Cuyamaca Mountains, Laguna Mountains, and others.  
The inflorescence bears 2 to 6 erect bell-shaped flowers. Each flower has three sepals and three white or pinkish petals. The petals are up to 3 centimeters long and spotted with red and yellow near the bases, where there are patches of yellow hairs.
The fruit is a narrow, angled capsule 2 to 3 centimeters long.
|Wikispecies has information related to: Calochortus dunnii|
- Jepson Manual Treatment of Calochortus dunnii
- USDA Plants Profile for Calochortus dunnii (Dunn's mariposa lily)
- Flora of North America
- UC Photos gallery — Calochortus dunnii
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