CNPS Inventory Plant Detail

Arctostaphylos canescens ssp. sonomensis

Common Name:	Sonoma canescent manzanita
Family:	Ericaceae
Synonyms:
Element Code:	PDERI04066
Full Name:	Arctostaphylos canescens Eastw. ssp. sonomensis (Eastw.) Wells
USDA PLANTS Symbol:	ARCAS3

Biology
Lifeform: perennial evergreen shrub Blooming Period: January - June Habitat: sometimes serpentinite. • Chaparral • Lower montane coniferous forest

Rarity Status

Rare Plant Rank: 1B.2
Rare, threatened, or endangered in California and elsewhere
.2: Fairly endangered in California
Federal Listing Status:
Not Listed
State Listing Status:
Not Listed
State Rank: S2.1
S2: Imperiled.
.1: Very threatened.
Global Rank: G3G4T2
T2: Imperiled. G3: (species) Vulnerable. G4: (species) Apparently secure, considering populations outside California.

Occurrence Data from DFG
California Natural Diversity Database

Total # of Known Element Occurrences: 25
Element Occurrence Ranks:

A B C D X U

1 4 2 0 0 18

Population Status:

Historic >20 yrs	Recent <=20 yrs
17	8

Presence:

Present Extant	Possibly Extirpated	Extirpated
25	0	0

Notes
Threatened by development and logging. See Leaflets of Western Botany 1:78 (1933) for original description, Four Seasons 7(3):42-46 (1985) for status update, and Madroño 35(4):330-341 (1988) for revised nomenclature. To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page. Date Added: 1988-01-01 Last Update: 2010-03-15

Location

Elevation: 180 - 1675 meters

California Endemic: yes

States: California

California Counties and Islands: name (code)
Colusa (COL), Humboldt (HUM), Lake (LAK), Mendocino (MEN), Sonoma (SON), Tehama (TEH), Trinity (TRI)

Quads: name (DWR code) USGS code
Rutherford (500B) 38122D4, Sonoma (500C) 38122C4, Santa Rosa (501B) 38122D6, Whispering Pines (533C) 38122G6, Wilbur Springs (547C) 39122A4, Bartlett Mtn. (549A) 39122B7, Cow Mountain (550A) 39123B1, Purdys Gardens (550D) 39123A1, Fouts Springs (564C) 39122C6, Elk Mountain (565C) 39122C8, Potato Hill (565D) 39122C7, Plaskett Ridge (581B) 39122F8, Hull Mountain (581C) 39122E8, Sanhedrin Mtn. (582D) 39123E1, Mendocino Pass (597C) 39122G8, Log Spring (597D) 39122G7, Noble Butte (600B) 39123H6, Leggett (600C) 39123G6, Sims Mountain (652A) 40123F5, Blake Mountain (652D) 40123E5, Grouse Mtn. (670C) 40123G6, Hennessy Peak (670D) 40123G5

Notes:

Definitions of codes preceding a county and/or quad:
*		Presumed extirpated
?		Uncertain about distribution or identity
?*		Uncertain about distribution, but presumed extirpated if once present
(?)		Occurrence confirmed, but possibly extirpated

Species may be present in other areas where conditions are favorable.

Presumed Extant

Presumed Extirpated or Unknown

205

Links to Leading Resources of Taxon Information
USDA PLANTS Calflora CalPhotos Consortium of California Herbaria California Department of Fish and Wildlife: CNDDB Quick Viewer

Suggested Citation
California Native Plant Society (CNPS). Inventory of Rare and Endangered Plants (online edition, v8-02). California Native Plant Society. Sacramento, CA. Accessed on .

-123.0,39.5