Taxon Report

Ceanothus pendletonensis D. O. Burge, Rebman & M. R. Mulligan

Pendleton ceanothus

Print Report

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:

Ecology and Life History


Lifeform:	perennial shrub
Blooming Period: Mar-Jun	Mar-Jun
Elevation:	110-870 (360-2855)
General Habitats:	Chaparral, Cismontane woodland
Microhabitat:	Granitic
Microhabitat Details:

Conservation Status


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

Occurrence Data from the CNDDB


Total Occurrences:	10
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	10

Location


California Endemic: True
California Counties and Islands: Name (Code)
San Diego (SDG)
Quads: Name (Quad Code)
Fallbrook (3311743), Margarita Peak (3311744)

Threat List Data from the CNDDB


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

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:

Selected References

Proposed Addition to CRPR 1B.2, G1 / S1 (2019)

Systematic Botany 42(3):529-542 (2017)

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].