Taxon Details

Ceanothus rigidus

Monterey ceanothus

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Taxon Summary:

Ceanothus rigidus, commonly known as Monterey ceanothus, is a perennial evergreen shrub in the Rhamnaceae that is found only in California. It occurs within Chaparral, Closed-cone coniferous forest, and Coastal scrub, growing at elevations from 3 to 550 meters. Ceanothus rigidus is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.

Classification

Scientific Name: Ceanothus rigidus Nutt.
Common Name: Monterey ceanothus
Family:	Rhamnaceae
Element Code:	PDRHA04067
USDA Plants Symbol:
Synonyms/Other Names: Ceanothus cuneatus var. rigidus
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	4.2
Fed List:	None
State List:	None
Global Rank:	G4
State Rank:	S4
Other Status:	SB_SBBG
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2025-03-05

Ecology and Life History

Lifeform: perennial evergreen shrub

Blooming Period: Feb-Apr(Jun)

Elevation:
3 - 550 meters
10 - 1805 feet

General Habitats:

Closed-cone coniferous forest
Chaparral
Coastal scrub

Microhabitat Details:

Microhabitat:

Sandy

Notes

Notes:
Threats: Threatened by development.
Taxonomy: Plants identified as C. rigidus in SLO and SBA cos. are part of the C. cuneatus complex and may belong to an undescribed taxon.

Threat List Data from the CNDDB

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

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					0
A	B	C	D	X	U
0	0	0	0	0	0

Occurrence Status:
Historical >20 Years	0
Recent <=20 Years	0

Presence:
Presumed Extant	0
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Monterey (MNT)

Quads: Name (Quad Code)
Big Sur (3612137), Marina (3612167), Monterey (3612158), Mt. Carmel (3612147), Prunedale (3612176), Salinas (3612166), Seaside (3612157), Soberanes Point (3612148), Spreckels (3612156), Watsonville East (3612186)

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

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CNPS Rare Plant Inventory