Localities documented in Tropicos sources
United States (North America)
Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
Global Range: Arroyo de la Cruz and Arroyo de los Chinos, San Luis Obispo County, California.
Comments: Grassland and low prostrate shrub community of immediate coast; in chaparral at ca. 60m elevation.
Number of Occurrences
Note: For many non-migratory species, occurrences are roughly equivalent to populations.
Estimated Number of Occurrences: 1 - 5
Comments: 2 element occurrences on 1 ridge.
Molecular Biology and Genetics
Barcode data: Ceanothus hearstiorum
Statistics of barcoding coverage: Ceanothus hearstiorum
Public Records: 1
Specimens with Barcodes: 1
Species With Barcodes: 1
National NatureServe Conservation Status
Rounded National Status Rank: N1 - Critically Imperiled
NatureServe Conservation Status
Rounded Global Status Rank: G1 - Critically Imperiled
Reasons: Endemic to Californai, Ceanothus hearstiorum is known from fewer than ten extant occurrences. Grazing and development are threats to this species.
Degree of Threat: High - medium
Comments: Devlopment and grazing are threats to this species (CNPS 2001, CNDDB 2003).
Ceanothus hearstiorum is a species of flowering shrub known by the common names Hearst Ranch buckbrush and Hearst's ceanothus. This Ceanothus is endemic to California, where it grows wild only on the hilly coastline of San Luis Obispo County.
This shrub is generally wider than it is tall and often lies prostrate in a mat on the ground. The younger branches are hairy and somewhat feltlike in texture. The distinctive evergreen leaves are oval to almost rectangular and have a cupped, rippled surface. The edges are toothed with tiny glandular knobs and the shiny surface may be dotted with more knobs. The underside of the leaf is fuzzy to hairy. The inflorescences are borne on short, stout stalks and the tiny flowers are lavender to blue with prominent yellow-anthered blue stamens.