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Taxon  Report  
Calochortus westonii  Eastw.
Shirley meadows star tulip
Calochortus westonii is a perennial herb (bulb) that is native to California, and endemic (limited) to California.
also called Calochortus coeruleus var. westonii
California Rare Plant Rank: 1B.2 (rare, threatened, or endangered in CA and elsewhere).
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
~58 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

Habitat: meadows

Communities: Yellow Pine Forest, Mixed Evergreen Forest

Name Status:
Accepted by JEF + CNPS + PLANTS

Alternate Names:
PLANTSCalochortus caeruleus var. westonii
JEF + CNPS + PLANTSCalochortus coeruleus var. westonii
Information about  Calochortus westonii from other sources
Nursery availability from CNPLX
Commercial availability unknown.
Jepson eFlora


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[Wikipedia] Range, Habitat, Description: Calochortus westonii, common name Shirley Meadow star-tulip, is a rare endemic plant known only from the Greenhorn Mountains range of the southern Sierra Nevada, within Kern and Tulare Counties, California. It grows in open locations in meadows and woodlands at elevations of 1,500?2,000 m (4,900?6,600 ft).[3] It is vulnerable due to habitat loss from logging, development of ski resort, and fuel breaks.[4] Description Calochortus westonii is bulb-forming herb attaining a height of up to 15 cm (5.9 in). Leaves are basal, persistent, and linear, up to 20 cm (7.9 in) long. Sepals are green, up to 10 mm (0.39 in) long. Petals are lanceolate, up to 12 mm (0.47 in) long, with long flexible hairs along the margins.[5][6][7][8] Flowers bloom from May to June and petals are white or blue in color.[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: 04/22/2024).