Ceanothus impressus
Santa barbara ceanothus
(c) harrier, some rights reserved (CC BY), uploaded by harrier · licence
Family: Rhamnaceae · Type: Shrub / Tree · Native
Ceanothus impressus (Santa barbara ceanothus) is a native California shrub / tree in the Rhamnaceae family, recognized by characteristic furrowed/impressed leaf surface.
Santa barbara ceanothus is a California native shrub found in coastal environments at moderate elevations. Flowering from March to May, this plant produces distinctive blue flowers in compact umbel-like clusters 1 to 3.5 centimeters long. Growing with ascending to erect stems featuring flexible, dark brown to gray-brown twigs, it forms an open to dense structure. Its evergreen leaves are widely ovate to nearly round, dark green on top with prominent vein furrows, densely short-hairy underneath, and measuring 5 to 25 millimeters long with thick, minutely gland-toothed margins that often curl slightly under. The shrub's compact form and textured blue blossoms make it a characteristic element of its native coastal habitat.
Identification and appearance
Key characters: 21 sympatric species; distinguished by characteristic furrowed/impressed leaf surface
Habitat and range
California counties: Santa Barbara, Los Angeles, Alameda, San Luis Obispo, Madera, Santa Clara
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 impressus native to California?
Yes. Ceanothus impressus is native to California (recorded as native).
Where in California does Ceanothus impressus grow?
Ceanothus impressus occurs in Santa Barbara, Los Angeles, Alameda, San Luis Obispo, Madera, Santa Clara.
What plant family does Ceanothus impressus belong to?
Ceanothus impressus is in the Rhamnaceae family, genus Ceanothus.
Related species
Other California species in the same genus, family, or bioregion.
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.