CNPS

CNPS Rare Plant Inventory

Species Details

Arctostaphylos auriculata

Mt. Diablo manzanita

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Photo by © 2006 Steve Matson max-height:128px; max-width:145px;
© 2006 Steve Matson 		Photo by © 2016 Neal Kramer max-height:128px; max-width:145px;
© 2016 Neal Kramer 		Photo by © 2006 Steve Matson max-height:128px; max-width:145px;
© 2006 Steve Matson

Classification

Scientific Name:
Arctostaphylos auriculata Eastw.
Common Name:
Mt. Diablo manzanita
Family: Ericaceae
Element Code: PDERI04040
USDA Plants Symbol: ARAU
Synonyms/Other Names:

Conservation Status

CA Rare Plant Rank: 1B.3
Fed List: None
State List: None
Global Rank: G2
State Rank:
 S2
Other Status:
CRPR Changes:
Add Date: 1974-01-01
Date Edited: 2021-05-26

Ecology and Life History

Lifeform: perennial evergreen shrub
Blooming Period: Jan-Mar
Elevation:
135 - 650 meters
445 - 2135 feet
General Habitat:
  • Chaparral (sandstone)
  • Cismontane woodland
General Micro Habitat:
Micro Habitat:

Notes

Notes:
Known from fewer than twenty occurrences. Threatened by road maintenance. See Bulletin of the Torrey Botanical Club 32:202 (1905) for original description, and American Midland Naturalist 23:622 (1940) for taxonomic treatment.
Threats:
Taxonomy:
Other:

Occurrence Data from the CNDDB

Total Occurrences: 17
Element Occurrence Ranks:
A B C D X U
2 5 5 0 0 5
Occurrence Status:
Historical >20 Years 13
Recent <=20 Years 4
Presence:
Presumed Extant 17
Possibly Extirpated 0
Presumed Extirpated 0

Location

California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Contra Costa (CCA), Mendocino (MEN)
Quads: Name (Quad Code)
Antioch South (3712187), Clayton (3712188), Diablo (3712178), Tassajara (3712177), Willis Ridge (3912353)
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
Print this Map
Counties   Quads

Selected References

Suggested Citation:
California Native Plant Society, Rare Plant Program. 2022. Rare Plant Inventory (online edition, v9-01 1.5). Website https://www.rareplants.cnps.org [accessed 4 July 2022].