CNPS Inventory Plant Detail

Ceanothus sonomensis

Common Name:	Sonoma ceanothus
Family:	Rhamnaceae
Synonyms:
Element Code:	PDRHA04420
Full Name:	Ceanothus sonomensis J.T. Howell
USDA PLANTS Symbol:	CESO

Biology
Lifeform: perennial evergreen shrub Blooming Period: February - April Habitat: • Chaparral (sandy, serpentinite or volcanic)

Rarity Status
CA Rare Plant Rank: 1B.2 Rare, threatened, or endangered in California and elsewhere .2: Fairly endangered in California Federal Listing Status: Not Listed State Listing Status: Not Listed State Rank: S2.2 S2: Imperiled. .2: Threatened. Global Rank: G2 G2: Imperiled.

Occurrence Data from DFG
California Natural Diversity Database

Total # of Known Element Occurrences: 22
Element Occurrence Ranks:

A B C D X U

1 0 0 0 0 21

Population Status:

Historic >20 yrs	Recent <=20 yrs
21	1

Presence:

Present Extant	Possibly Extirpated	Extirpated
22	0	0

Notes
Seriously threatened by habitat alteration and development. Closely related to C. cuneatus. To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page. Date Added: 1974-01-01 Last Update: 2011-10-12

Location

Elevation: 215 - 800 meters

California Endemic: yes

States: California

California Counties and Islands: name (code)
Napa (NAP), Sonoma (SON)

Quads: name (DWR code) USGS code
Rutherford (500B) 38122D4, Sonoma (500C) 38122C4, Kenwood (501A) 38122D5, Santa Rosa (501B) 38122D6, Detert Reservoir (517A) 38122F5

Notes:

Definitions of codes preceding a county and/or quad:
*		Presumed extirpated
?		Uncertain about distribution or identity
?*		Uncertain about distribution, but presumed extirpated if once present
(?)		Occurrence confirmed, but possibly extirpated

Species may be present in other areas where conditions are favorable.

Presumed Extant

Presumed Extirpated or Unknown

218

Links to Leading Resources of Taxon Information
USDA PLANTS Calflora CalPhotos Consortium of California Herbaria California Department of Fish and Game: CNDDB Quick Viewer

Suggested Citation
California Native Plant Society (CNPS). Inventory of Rare and Endangered Plants (online edition, v8-01a). California Native Plant Society. Sacramento, CA. Accessed on .

-122.5,38.375