Taxon Report

Arctostaphylos imbricata Eastw.

San Bruno Mountain manzanita

Print Report

Taxon Summary

Arctostaphylos imbricata, commonly known as San Bruno Mountain manzanita, is a perennial evergreen shrub in the Ericaceae that is found only in California. It occurs within Chaparral, and Coastal scrub, growing at elevations from 275 to 370 meters. Arctostaphylos imbricata is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Arctostaphylos imbricata Eastw.
Common Name:	San Bruno Mountain manzanita
Family:	Ericaceae
Element Code:	PDERI040L0
USDA Plants Symbol:	ARIM
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial evergreen shrub
Blooming Period: Feb-May	Feb-May
Elevation:	275-370 (900-1215)
General Habitats:	Chaparral, Coastal scrub
Microhabitat:	Rocky
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G1
State Rank:	S1
State List:	CE
Fed List:	None
Other Status:
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	2
Element Occurrence Ranks:
Excellent (A)	1
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	1

Location


California Endemic: True
California Counties and Islands: Name (Code)
San Mateo (SMT)
Quads: Name (Quad Code)
San Francisco South (3712264)

Threat List Data from the CNDDB


Threat List Total:	2
EOs with Threat Listed:	Total EOs	% of EOs
	1	50 %
ORV activity	1	50%
Other	1	50%

Notes



All occurrences are within the boundaries of the San Bruno Mtn. HCP. See Proceedings of the California Academy of Sciences IV 20:149 (1931) for original description.
Threats:
Threatened by fungal infection, and possibly by alteration of fire regimes.
Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 4 November 2025].