Species Details

Ceanothus confusus

Rincon Ridge ceanothus

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Classification

Scientific Name: Ceanothus confusus J.T. Howell
Common Name: Rincon Ridge ceanothus
Family:	Rhamnaceae
Element Code:	PDRHA04220
USDA Plants Symbol:	CECO6
Synonyms/Other Names:

Conservation Status

CA Rare Plant Rank:	1B.1
Fed List:	None
State List:	None
Global Rank:	G1
State Rank:	S1
Other Status:	BLM_S; SB_SBBG
CRPR Changes:
Add Date:	1980-01-01
Date Edited:	2023-08-01

Ecology and Life History

Lifeform: perennial evergreen shrub

Blooming Period: Feb-Jun

Elevation:
75 - 1065 meters
245 - 3495 feet

General Habitats:

Closed-cone coniferous forest
Chaparral
Cismontane woodland

Microhabitat Details:

Microhabitat:

Serpentine (sometimes)
Volcanic (sometimes)

Notes

Notes: Closely related to C. prostratus. See Leaflets of Western Botany 2:160-162 (1939) for original description.
Threats: Threatened by development.
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	9
	Total EOs	% of EOs
EOs with Threat Listed:	12	36 %
Development	8	24%
Road/trail construction/maint.	8	24%
Agriculture	4	12%
ORV activity	3	9%
Other	1	3%
Recreational use (non-ORV)	1	3%
Grazing	1	3%
Logging	1	3%
Wood cutting or brush clearing	1	3%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					33
A	B	C	D	X	U
1	2	5	0	1	24

Occurrence Status:
Historical >20 Years	24
Recent <=20 Years	9

Presence:
Presumed Extant	32
Possibly Extirpated	0
Presumed Extirpated	1

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Lake (LAK), Mendocino (MEN), Napa (NAP), Sonoma (SON)

Quads: Name (Quad Code)
Bartlett Mtn. (3912227), Calistoga (3812255)?*, Camp Meeker (3812248), Cloverdale (3812371), Detert Reservoir (3812265), Geyserville (3812268), Guerneville (3812258), Kenwood (3812245), Mark West Springs (3812256), Mount St. Helena (3812266), Purdys Gardens (3912311), Rutherford (3812244), Santa Rosa (3812246), Sebastopol (3812247)*, Sonoma (3812234), St. Helena (3812254), The Geysers (3812277), Whispering Pines (3812276), Yorkville (3812382)

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

Species Account:

Profile for potential SCC evaluation (2018)