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Monterey ceanothus

Scientific Name: Ceanothus cuneatus var. rigidus

Family: Rhamnaceae

Category: Dicot

Growth: Shrub

Duration: Perennial

Other Names:

       

Monterey Ceanothus (Ceanothus rigidus)

Monterey Ceanothus, scientifically known as Ceanothus rigidus, is a fascinating shrub native to California. It is also commonly referred to as Monterey ceanothus, buckbrush, or California lilac.

Considerations for Pets and Children

  • Some varieties have small, dark green, leathery, holly-like leaves that may be tempting to explore.
  • The species has stiff branches.
  • One source notes the twigs can be bristly.

Taxonomy and Nomenclature

  • Scientific Name: Ceanothus rigidus Nutt.
  • Family: Rhamnaceae (Buckthorn)
  • Synonyms:
    • Ceanothus cuneatus var. rigidus (previously)
    • Ceanothus cuneatus ssp. rigidus
    • rigidus var. albus
    • Ceanothus rigidus var. pallens
    • Ceanothus verrucosus var. rigidus
  • Element Code: PDRHA04067

Distribution and Habitat

  • Ceanothus rigidus is endemic to California, meaning it is naturally limited to this region.
  • Specifically, it is found in the central coast of California, including Monterey, Santa Cruz (presumed extirpated), and San Luis Obispo counties.
  • It thrives in habitats ranging from sand dunes along Monterey Bay to maritime chaparral and closed-cone conifer forests on sandy hills.
  • Prefers coastal locations.

Morphological Characteristics and Growth Habits

  • It is an evergreen shrub.
  • It is often described as a highly branched and dense shrub.
  • Typically grows to 4 feet tall and spreads to 10 feet wide.
  • Some varieties, like 'Snowball', have white flower clusters covering the foliage in spring.
  • 'Snowball' grows about 4’ x 4’ with a dense habit, stiff branches, and leathery leaves.
  • Leaves can be small with folded margins.

Ecological Role

  • It is a nitrogen-fixing shrub.
  • Ceanothus provides food and cover for birds and nectar.

Quirky Facts

  • One source described half of a miniature Monterey ceanothus consisting of bare twigs "bristly as a..." but the sentence was cut off.

Further Information

  • RHS (Royal Horticultural Society) provides information on Ceanothus rigidus.
  • UCSC (University of California, Santa Cruz) Natural Reserves has information available.
  • USDA-NRCS PLANTS Database provides images.
  • California Native Plant Society may have photos and text, but usage requires written permission.
  • Dave's Garden is a community sharing tips and ideas for gardens.