CNPS

CNPS Rare Plant Inventory



Taxon Details

Ceanothus pendletonensis

Pendleton ceanothus

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Photo of Ceanothus pendletonensis
© 2019 Ron Vanderhoff 		Photo of Ceanothus pendletonensis
© 2019 Ron Vanderhoff 		Photo of Ceanothus pendletonensis
© 2019 Ron Vanderhoff

Taxon Summary:

Ceanothus pendletonensis, commonly known as Pendleton ceanothus, is a perennial shrub in the Rhamnaceae that is found only in California. It occurs within Chaparral, and Cismontane woodland, growing at elevations from 110 to 870 meters. Ceanothus pendletonensis is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

  Classification

Scientific Name:
Ceanothus pendletonensis D. O. Burge, Rebman & M. R. Mulligan
Common Name:
Pendleton ceanothus
Family: Rhamnaceae
Element Code: PDRHA04450
USDA Plants Symbol:
Synonyms/Other Names:
Name Status: JEF, FNA, POWO,
IPNI, Tropicos

  Conservation Status

CA Rare Plant Rank: 1B.2
Fed List: None
State List: None
Global Rank: G1
State Rank:
 S1
Other Status: SB_CRES
CRPR Changes:
added to 1B.2 on 2019-01-30
Add Date: 2019-01-30
Date Edited: 2023-08-01

  Ecology and Life History

Lifeform: perennial shrub
Blooming Period: Mar-Jun
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Elevation:
110 - 870 meters
360 - 2855 feet
General Habitats:
  • Chaparral
  • Cismontane woodland
Microhabitat Details:
Microhabitat:
  • Granitic

  Notes

Notes:
Similar to C. leucodermis and C. spinosus; differentiated by warty stem texture and shorter leaves.
Threats:
Possibly threatened by road widening and military activities.
Taxonomy:

  Threat List Data from the CNDDB

Threat List Total: 0
Total EOs % of EOs
EOs with Threat Listed: 0 %
THREAT LIST:

 

  Occurrence Data from the CNDDB

Total Occurrences: 10
Element Occurrence Ranks:
A B C D X U
0 0 0 0 0 10
Occurrence Status:
Historical >20 Years 0
Recent <=20 Years 10
Presence:
Presumed Extant 10
Possibly Extirpated 0
Presumed Extirpated 0

  Location

California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
San Diego (SDG)
Quads: Name (Quad Code)
Fallbrook (3311743), Margarita Peak (3311744)
Notes:
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.
Regional Map

  Map

Presumed Extant
Click on quad for name. Hold Shift Key to use mouse scroll wheel

  Selected References

CNPS Status Review: Proposed Addition to CRPR 1B.2, G1 / S1 (2019)
Original Description: Systematic Botany 42(3):529-542 (2017)

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Suggested Citation:
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 27 January 2025].
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