Ceanothus crassifolius
Hoaryleaf ceanothus, Hoaryleaf Ceanothus
Photo by Chez Brungraber
Family: Rhamnaceae · Type: Shrub · Native
Ceanothus crassifolius (Hoaryleaf ceanothus) is a native California shrub in the Rhamnaceae family, recognized by . Large size, opposite hairy leaves, and white flowers with dark centers diagnostic.
Hoaryleaf ceanothus is a California native shrub found in chaparral habitats at moderate elevations. Flowering from March to May, this plant produces white flowers in compact umbel-like clusters up to 2 centimeters long. Growing as an upright shrub less than 4 meters tall with ascending stems covered in white to rusty-colored felt-like hair, it forms an open, distinctive branching pattern. Its evergreen leaves are opposite, elliptic, with olive-green surfaces above and pale, densely hairy undersides measuring 10 to 25 millimeters long. The distinctive fruits are rounded, 5 to 9 millimeters wide with short 1 to 2 millimeter horns.
Identification and appearance
Key characters: 32 sympatric species. Large size, opposite hairy leaves, and white flowers with dark centers diagnostic.
Habitat and range
California counties: Los Angeles, San Diego, Orange, San Bernardino, Riverside, Ventura, Santa Barbara, Santa Cruz, Kern, San Luis Obispo, Alameda
How to tell it apart
vs Rhamnus: Ceanothus has showy blue/white/pink flowers in dense clusters; Rhamnus has tiny inconspicuous greenish flowers.; vs Quercus: Ceanothus has showy flower clusters and small leaves; Quercus has acorns and distinctive lobed or toothed oak leaves.; vs Baccharis: Ceanothus has individual flowers with 5 separate petals; Baccharis has composite flower heads with tiny disc flowers.; vs Cercocarpus: Ceanothus has blue/white/pink flowers in clusters; Cercocarpus has tiny flowers with no petals and feathery fruiting tails.; vs Adenostoma: Ceanothus flowers have 5 distinct colored petals; Adenostoma has tiny white flowers and needle-like clustered leaves.
Frequently asked questions
Is Ceanothus crassifolius native to California?
Yes. Ceanothus crassifolius is native to California (recorded as native).
Where in California does Ceanothus crassifolius grow?
Ceanothus crassifolius occurs in Los Angeles, San Diego, Orange, San Bernardino, Riverside, Ventura, Santa Barbara, Santa Cruz and other counties.
What plant family does Ceanothus crassifolius belong to?
Ceanothus crassifolius is in the Rhamnaceae family, genus Ceanothus.
Related species
Other California species in the same genus, family, or bioregion.
- Ceanothus crassifolius var. crassifolius — Hoary leaved ceanothus
- Ceanothus crassifolius var. planus — Hoary leaved ceanothus
- Ceanothus cuneatus — Buck brush
- Ceanothus cuneatus var. cuneatus — Buckbrush
- Ceanothus cuneatus var. fascicularis — Lompoc ceanothus
- Ceanothus cuneatus var. ramulosus — Buck brush
Sources: Jepson eFlora · Index of California Plant Names · CalPhotos
Last updated 2026-10-07
Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Cal-IPC, and more.