Taxon Report

Ceanothus thyrsiflorus Eschsch. var. obispoensis D. O. Burge

San Luis Obispo ceanothus

Print Report

Classification


Scientific Name:	Ceanothus thyrsiflorus Eschsch. var. obispoensis D. O. Burge
Common Name:	San Luis Obispo ceanothus
Family:	Rhamnaceae
Element Code:	PDRHA04461
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial shrub
Blooming Period: Jun	Jun
Elevation:	140-225 (460-740)
General Habitats:	Chaparral, Cismontane woodland
Microhabitat:
Microhabitat Details:	Dacite

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G5T1
State Rank:	S1
State List:	None
Fed List:	None
Other Status:	SB_UCSC
CRPR Changes:	added to 1B.1 on 2019-01-30

Occurrence Data from the CNDDB


Total Occurrences:	3
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	3

Location


California Endemic: True
California Counties and Islands: Name (Code)
San Luis Obispo (SLO)
Quads: Name (Quad Code)
Morro Bay South (3512037)

Threat List Data from the CNDDB


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

Notes



Similar to C. thyrsiflorus var. griseus; differentiated by dense, wavy, matted hairs on abaxial surfaces of young leaves and twigs, often forming a tomentum that obscures tertiary leaf venation.
Threats:
Potentially threatened by urbanization.
Taxonomy:

Selected References

Proposed Addition to CRPR 1B.1 G5T1/ S1 (2019)

Systematic Botany 42(3):529-542 (2017)

Citation California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 25 December 2024].