Ceanothus impressus var. impressus
Santa barbara ceanothus
(c) harrier, some rights reserved (CC BY), uploaded by harrier · licence
Family: Rhamnaceae · Type: Shrub / Tree · Native
Conservation status: CNPS 1B.2
Ceanothus impressus var. impressus (Santa barbara ceanothus) is a native California shrub / tree in the Rhamnaceae family, recognized by var. nipomensis by smaller leaves and denser growth form.
Santa barbara ceanothus is a rare (CNPS 1B.2) California native shrub found in southern central coastal California, specifically western Santa Barbara County, growing in sandy substrates, flats, and canyons at elevations below 320 meters. Flowering from February to April, this plant produces small clusters of delicate blue to white flowers in compact, dense formations. Growing as an erect, generally dense shrub reaching up to 2 meters tall, it develops stiff, well-branched stems that create a compact overall structure. Its leaves are relatively small, with blade-like surfaces 5 to 14 millimeters long and 3 to 12 millimeters wide, creating a dense, textured foliage pattern. The shrub forms a distinctive, tightly arranged growth habit characteristic of its coastal chaparral environment.
Identification and appearance
Key characters: 21 sympatric species; distinguished from var. nipomensis by smaller leaves and denser growth form
Habitat and range
Habitat: Sandy substrates, flats, canyons
Elevation: < 320 m
California counties: Los Angeles, Santa Barbara
Bloom period
Ceanothus impressus var. impressus blooms Feb-Apr.
Conservation status
CNPS 1B.2
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 var. impressus native to California?
Yes. Ceanothus impressus var. impressus is native to California (recorded as native).
When does Ceanothus impressus var. impressus bloom?
Ceanothus impressus var. impressus blooms Feb-Apr.
Where in California does Ceanothus impressus var. impressus grow?
Ceanothus impressus var. impressus occurs in Los Angeles, Santa Barbara, at elevations of < 320 m.
What plant family does Ceanothus impressus var. impressus belong to?
Ceanothus impressus var. impressus is in the Rhamnaceae family, genus Ceanothus.
Is Ceanothus impressus var. impressus rare or endangered?
Ceanothus impressus var. impressus carries California Rare Plant Rank 1B.2, state rank S3.
Related species
Other California species in the same genus, family, or bioregion.
Sources: Jepson eFlora · CNPS Rare Plant Inventory · Index of California Plant Names · CalPhotos · CDFW CNDDB
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.