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Taxon  Report  
Calochortus umbellatus  Alph. Wood
Oakland mariposa lily,   Oakland star tulip
Calochortus umbellatus is a perennial herb (bulb) that is native to California, and endemic (limited) to California.
California Rare Plant Rank: 4.2 (limited distribution).
Siskiyou Del Norte Modoc Humboldt Shasta Lassen Trinity Plumas Tehama Butte Mendocino Glenn Sierra Yuba Lake Nevada Colusa Placer Sutter El Dorado Yolo Alpine Napa Sonoma Sacramento Mono Amador Solano Calaveras Tuolumne San Joaquin Marin Contra Costa Alameda Santa Cruz Mariposa Madera San Francisco San Mateo Merced Fresno Stanislaus Santa Clara Inyo San Benito Tulare Kings Monterey San Bernardino San Luis Obispo Kern Santa Barbara Ventura Los Angeles Riverside Orange San Diego Imperial
Observation Search
~689 records in California
yellowone or more occurrences
within a 7.5-minute quadrangle

Bloom Period
Genus: Calochortus
Family: Liliaceae  
Category: angiosperm  
PLANTS group:Monocot
Jepson eFlora section: monocot

Ultramafic affinity: 2.9 - strong indicator

Communities: Yellow Pine Forest, Mixed Evergreen Forest, Chaparral, Valley Grassland

Name Status:
Accepted by JEF + CNPS + PLANTS

Alternate Names:
ICPNCalochortus collinus
Information about  Calochortus umbellatus from other sources
Nursery availability from CNPLX
This plant is available commercially.
Jepson eFlora


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[Wikipedia] Distribution, Description: Calochortus umbellatus is a flowering plant in the lily family found only in California in the United States.[3][4] The common name for this species is Oakland mariposa lily or Oakland star-tulip. Distribution The species is a California endemic of limited distribution.[5] It grows primarily in the San Francisco Bay Region, often on serpentine soils,[6] with a few isolated populations in Humboldt, Mendocino, and Nevada Counties.[7] Description Calochortus umbellatus is a branching perennial herb up to 25 cm tall. Inflorescence is sub-umbellate with 3-10 white or pale pink flowers.[8] This species is included on the California Native Plant Society list 4.2 of rare and endangered plants.[9] (contributed by Mary Ann Machi)

Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals. [web application]. 2024. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 04/12/2024).