Ceanothus oliganthus

Ceanothus oliganthus
Ceanothus oliganthus var. sorediatus
Vulnerable
Vulnerable (NatureServe)
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Rosales
Family: Rhamnaceae
Genus: Ceanothus
Species:
C. oliganthus
Binomial name
Ceanothus oliganthus
Varieties
  • Ceanothus oliganthus var. oliganthus
  • Ceanothus oliganthus var. orcutii (Parry) Jeps.
  • Ceanothus oliganthus var. sorediatus (Hook. & Arn.) Hoover
Synonyms

synonyms of var. oliganthus:

  • Ceanothus divaricatus Nutt.
  • Ceanothus hirsutus Nutt.
  • Ceanothus hirsutus var. orcuttii Trel.
  • Ceanothus oliganthus var. hirsutus K.Brandegee

synonyms of var. orcutii:

  • Ceanothus orcuttii Parry

synonyms of var. sorediatus:

  • Ceanothus collinus Douglas ex Knowles & Westc.
  • Ceanothus hirsutus var. glaber (S.Watson) S.Watson
  • Ceanothus intricatus Parry
  • Ceanothus nitidus Torr.
  • Ceanothus oliganthus subsp. sorediatus (Hook. & Arn.) C.L.Schmidt
  • Ceanothus sorediatus Hook. & Arn.
  • Ceanothus sorediatus var. glaber S.Watson

Ceanothus oliganthus is a species of shrub in the family Rhamnaceae known by the common name hairy ceanothus or hairy-leaf ceanothus.

Three varieties are accepted.

The variety of this species known as jimbrush (var. sorediatus) is sometimes treated as a separate species.

Habitat and range

It occurs in California and Baja California, where it occurs through all of the coastal mountain ranges in dry habitat such as chaparral.

Description

This is a large, erect shrub approaching 3 meters in maximum height.[citation needed]

Leaves and stems

The stipules (small leaf-like structures on the stems at the base of the leaf stem, are thin and fall off early.

The evergreen leaves are alternately arranged and may be up to 4 centimeters long.[citation needed] They are dark green on top, paler and hairy on the underside,[citation needed] and are edged with glandular teeth.[citation needed] Leaves have 3 main veins rising from the base. Leaves have a toothed edge. The leaf is covered with short, soft hairs on the top.

Branchlets are flexible, not stiff.

Inflorescence and fruit

The inflorescence is a cluster or series of clusters of blue or purple flowers.

The fruit is a capsule which may be hairy or not, depending on variety.

The fruit is not horned.

It blooms April to May.

References

  1. ↑ Carrero, C. (2022). "Ceanothus oliganthus". IUCN Red List of Threatened Species. 2022 e.T153739881A153834851. doi:10.2305/IUCN.UK.2022-2.RLTS.T153739881A153834851.en. Retrieved 18 September 2026.
  2. ↑ "NatureServe Explorer". NatureServe Explorer. NatureServe. 2022. Retrieved 28 May 2022.
  3. 1 2 "Ceanothus oliganthus Nutt". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 17 September 2026.
  4. ↑ "Ceanothus oliganthus var. oliganthus". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 18 September 2026.
  5. ↑ "Ceanothus oliganthus var. orcutii (Parry) Jeps". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 17 September 2026.
  6. ↑ "Ceanothus oliganthus var. sorediatus (Hook. & Arn.) Hoover". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 18 September 2026.
  7. ↑ NRCS. "Ceanothus oliganthus". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 6 June 2016.
  8. 1 2 3 4 5 6 7 Flowering Plants of the Santa Monica Mountains, Nancy Dale, 2nd Ed., 2000, p. 167
  9. ↑ USDA Plants Profile: var. sorediatus
  10. ↑ Ceanothus oliganthus at CalFlora
  11. ↑ Jepson Herbarium