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Taxon  Report  
Ceanothus masonii  McMinn
Bolinas ceanothus,   Mason's ceanothus
Ceanothus masonii is a shrub that is native to California, and endemic (limited) to California.
California Rare Plant Rank: 1B.2 (rare, threatened, or endangered in CA and elsewhere).
State of California status: Rare.
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
~48 records in California
yellowone or more occurrences
within a 7.5-minute quadrangle
DJJJASONAFMM

Bloom Period
Genus: Ceanothus
Family: Rhamnaceae  
Category: angiosperm  
PLANTS group:Dicot
Jepson eFlora section: eudicot

Ultramafic affinity: 3.3 - strong indicator

Communities: Chaparral

Name Status:
Accepted by JEF + CNPS + PLANTS + POWO
Information about  Ceanothus masonii from other sources
Nursery availability from CNPLX
Commercial availability unknown.
Jepson eFlora

USDA PLANTS Profile (CEMA3)

Photos on Calflora

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Google Images

Photos on iNaturalist

ID Tips on PlantID.net


Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals. [web application]. 2025. The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 04/23/2025).