Species Details

Ceanothus divergens

Calistoga ceanothus

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Classification

Scientific Name: Ceanothus divergens Parry
Common Name: Calistoga ceanothus
Family:	Rhamnaceae
Element Code:	PDRHA04240
USDA Plants Symbol:	CEDI
Synonyms/Other Names:

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G2
State Rank:	S2
Other Status:	BLM_S; SB_UCSC
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2024-11-05

Ecology and Life History

Lifeform: perennial evergreen shrub

Blooming Period: Feb-Apr

Elevation:
170 - 950 meters
560 - 3115 feet

General Habitats:

Chaparral (rocky, serpentinite, volcanic)

Microhabitat Details:

Microhabitat:

Notes

Notes: Threatened by habitat alteration and development in The Geysers geothermal area and by fire suppression. Closely related to C. purpureus.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	8
	Total EOs	% of EOs
EOs with Threat Listed:	11	42 %
Improper burning regime	3	11%
Agriculture	3	11%
Development	3	11%
Foot traffic/trampling	2	7%
Other	2	7%
Road/trail construction/maint.	2	7%
Wood cutting or brush clearing	1	3%
Erosion/runoff	1	3%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					26
A	B	C	D	X	U
2	5	3	2	0	14

Occurrence Status:
Historical >20 Years	16
Recent <=20 Years	10

Presence:
Presumed Extant	26
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

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

Quads: Name (Quad Code)
Calistoga (3812255), Detert Reservoir (3812265), Kenwood (3812245), Mark West Springs (3812256), Mount St. Helena (3812266), Rutherford (3812244), Santa Rosa (3812246), St. Helena (3812254), The Geysers (3812277), Whispering Pines (3812276)

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

CNPS Rare Plant Inventory