Taxon Report

Arctostaphylos pacifica Roof

Pacific manzanita

Print Report

Taxon Summary

Arctostaphylos pacifica, commonly known as Pacific manzanita, is a evergreen shrub in the Ericaceae that is found only in California. It occurs within Chaparral, and Coastal scrub, growing at elevations from 330 to 330 meters. Arctostaphylos pacifica is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Arctostaphylos pacifica Roof
Common Name:	Pacific manzanita
Family:	Ericaceae
Element Code:	PDERI040Z0
USDA Plants Symbol:	ARPA19
Synonyms/Other Names:

Ecology and Life History


Lifeform:	evergreen shrub
Blooming Period: Feb-Apr	Feb-Apr
Elevation:	330-330 (1085-1085)
General Habitats:	Chaparral, Coastal scrub
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G1
State Rank:	S1
State List:	CE
Fed List:	None
Other Status:	SB_UCSC
CRPR Changes:	changed from 1B.2 to 1B.1 on 2017-02-16 added to 1B.2 on 2007-03-05

Occurrence Data from the CNDDB


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

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:	4
EOs with Threat Listed:	Total EOs	% of EOs
	1	100 %
Improper burning regime	1	100%
Non-native plant impacts	1	100%
ORV activity	1	100%
Other	1	100%

Notes



Known only from San Bruno Mountain in San Mateo County. Potentially threatened by alteration of fire regimes and recreational activities. Once considered a hybrid between A. glandulosa and A. uva-ursi. See A. uva-ursi in The Jepson Manual (1993). See Leaflets of Western Botany IX (13-14): 217 (1962) for original description.
Threats:

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 30 January 2025].