Species Details

Arctostaphylos stanfordiana ssp. decumbens

Rincon Ridge manzanita

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Classification

Scientific Name: Arctostaphylos stanfordiana Parry ssp. decumbens Wells
Common Name: Rincon Ridge manzanita
Family:	Ericaceae
Element Code:	PDERI041G4
USDA Plants Symbol:	ARSTD4
Synonyms/Other Names: Arctostaphylos stanfordiana Parry var. repens Roof

Conservation Status

CA Rare Plant Rank:	1B.1
Fed List:	None
State List:	None
Global Rank:	G3T1
State Rank:	S1
Other Status:	SB_UCSC
CRPR Changes:
Add Date:	1984-01-01
Date Edited:	2022-12-06

Ecology and Life History

Lifeform: perennial evergreen shrub

Blooming Period: Feb-Apr(May)

Elevation:
75 - 370 meters
245 - 1215 feet

General Habitats:

Chaparral (rhyolitic)
Cismontane woodland

Microhabitat Details:

Microhabitat:

Notes

Notes: Known from approximately ten occurrences. Seriously threatened by development, road construction, vehicles, and viticulture. See Four Seasons 4(2):16 (1972) for original description and 9(2):60-63 (1992) for revised nomenclature.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	9
	Total EOs	% of EOs
EOs with Threat Listed:	8	67 %
Development	7	58%
Agriculture	4	33%
Road/trail construction/maint.	3	25%
ORV activity	3	25%
Other	1	8%
Mining	1	8%
Non-native plant impacts	1	8%
Vandalism/dumping/litter	1	8%
Wood cutting or brush clearing	1	8%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					12
A	B	C	D	X	U
0	2	2	1	1	6

Occurrence Status:
Historical >20 Years	8
Recent <=20 Years	4

Presence:
Presumed Extant	11
Possibly Extirpated	0
Presumed Extirpated	1

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Napa (NAP), Sonoma (SON)

Quads: Name (Quad Code)
Calistoga (3812255), Camp Meeker (3812248), Cazadero (3812351), Geyserville (3812268), Kenwood (3812245), Rutherford (3812244), Santa Rosa (3812246), Sebastopol (3812247)

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

Click on quad for name. Hold Shift Key to use mouse scroll wheel

CNPS Rare Plant Inventory