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Taxon  Report  
Streptanthus hispidus  A. Gray
Mt. diablo jewel flower,   Mt. diablo jewelflower
Streptanthus hispidus is an annual herb that is native to California, and endemic (limited) to California.
California Rare Plant Rank: 1B.3 (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
(83 records)
yellowone or more occurrences
within a 7.5-minute quadrangle

Bloom Period
Genus: Streptanthus
Family: Brassicaceae  
Category: angiosperm  
PLANTS group:Dicot
Jepson eFlora section: eudicot

Communities: Chaparral, Valley Grassland
Name Status:
Accepted by JEF + CNPS + PLANTS

Information about  Streptanthus hispidus from other sources
Nursery availability from CNPLX
Commercial availability unknown.
Jepson eFlora


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[Wikipedia] Distribution, Description, Rarity: Streptanthus hispidus, the Mt. Diablo jewelflower,[2] is a rare species of flowering plant in the mustard family. Distribution It is endemic to Contra Costa County, California, where it is known from fewer than 15 occurrences on and around Mount Diablo. It grows in rocky outcrops in grassland and chaparral habitat. It is threatened by habitat degradation, such as trampling by hikers and destruction during maintenance activities.[3] Description Streptanthus hispidus is a bristly annual herb growing up to 30 centimeters tall. Flowers occur in a raceme, the uppermost ones often sterile and different in form. The bristly bell-shaped calyx of sepals is greenish brown in the fertile flowers and purple in the sterile. Fertile flowers have four light purple petals up to a centimeter long. The fruit is a bristly silique up to 8 centimeters in length. (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]. 2023. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 11/30/2023).