Ceanothus prostratus var. occidentalis
Mahala mats
Photo: parent species Ceanothus prostratus · no rights reserved · CC0
Family: Rhamnaceae · Type: Shrub · Native
Ceanothus prostratus var. occidentalis (Mahala mats) is a native California shrub in the Rhamnaceae family, recognized by distinguishing features are folded leaves and spreading fruit horns.
Mahala mats is a California native shrub found in southern North Coast Ranges in volcanic soils, open flats, ridges, and conifer forest at elevations of 270 to 1,400 meters. Flowering from April to May, this plant produces white flowers with distinctive mound-like growth. Growing as a low, spreading shrub with a compact, ground-hugging form, it creates dense mat-like clusters across the landscape. Its leaves are uniquely folded lengthwise, with slightly wavy margins featuring 5 to 9 teeth along the upper half of the leaf blade. The fruit develops with spreading horns, adding to the plant's distinctive architectural structure.
Identification and appearance
Key characters: 32 sympatric species; distinguishing features are folded leaves and spreading fruit horns
Habitat and range
Habitat: Volcanic soils, open flats, ridges, conifer forest
Elevation: 270-1400 m
Bloom period
Ceanothus prostratus var. occidentalis blooms Apr-May.
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 prostratus var. occidentalis native to California?
Yes. Ceanothus prostratus var. occidentalis is native to California (recorded as native).
When does Ceanothus prostratus var. occidentalis bloom?
Ceanothus prostratus var. occidentalis blooms Apr-May.
What plant family does Ceanothus prostratus var. occidentalis belong to?
Ceanothus prostratus var. occidentalis is in the Rhamnaceae family, genus Ceanothus.
What habitat does Ceanothus prostratus var. occidentalis grow in?
Ceanothus prostratus var. occidentalis grows in Volcanic soils, open flats, ridges, conifer forest.
Related species
Other California species in the same genus, family, or bioregion.
Sources: Jepson eFlora · CalPhotos
Last updated 2026-09-30
Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Cal-IPC, and more.