Taxon Report

Ceanothus impressus Trel. var. nipomensis McMinn

Nipomo Mesa ceanothus

Print Report

Taxon Summary

Ceanothus impressus var. nipomensis, commonly known as Nipomo Mesa ceanothus, is a perennial shrub in the Rhamnaceae that is found only in California. It occurs within Chaparral, growing at elevations from 30 to 245 meters. Ceanothus impressus var. nipomensis is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Ceanothus impressus Trel. var. nipomensis McMinn
Common Name:	Nipomo Mesa ceanothus
Family:	Rhamnaceae
Element Code:	PDRHA040L2
USDA Plants Symbol:	CEIMN
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial shrub
Blooming Period: Feb-Apr	Feb-Apr
Elevation:	30-245 (100-805)
General Habitats:	Chaparral
Microhabitat:	Sandy
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G3T2
State Rank:	S2
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	changed from CBR to 1B.2 on 2019-05-15 Considered But Rejected on 2006-01-10

Occurrence Data from the CNDDB


Total Occurrences:	14
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	14

Location


California Endemic: False
California Counties and Islands: Name (Code)
San Luis Obispo (SLO)
Quads: Name (Quad Code)
Arroyo Grande NE (3512025), Nipomo (3512014), Oceano (3512015), Pismo Beach (3512026)

Threat List Data from the CNDDB


Threat List Total:	2
EOs with Threat Listed:	Total EOs	% of EOs
	1	7 %
Agriculture	1	7%
Development	1	7%

Notes




Threats:
Possibly threatened by development and non-native plants.
Taxonomy:

Selected References

Proposed Addition to CRPR 1B.2, G3T2 / S2 (2019)

Ceanothus pp. 219-220 (1942)

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 5 November 2025].