Taxon Details

Quercus cedrosensis

Cedros Island oak

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Taxon Summary:

Quercus cedrosensis, commonly known as Cedros Island oak, is a perennial evergreen tree in the Fagaceae that is found in California and elsewhere. It occurs within Chaparral, Closed-cone coniferous forest, and Coastal scrub, growing at elevations from 255 to 960 meters. Quercus cedrosensis is ranked 2B.2, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Moderately threatened in California.

Classification

Scientific Name: Quercus cedrosensis C.H. Muller
Common Name: Cedros Island oak
Family:	Fagaceae
Element Code:	PDFAG05650
USDA Plants Symbol:	QUCE2
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	2B.2
Fed List:	None
State List:	None
Global Rank:	G2G3
State Rank:	S1
Other Status:	IUCN_VU; SB_CRES; SB_SDBG
CRPR Changes:
Add Date:	2001-01-01
Date Edited:	2024-08-06

Ecology and Life History

Lifeform: perennial evergreen tree

Blooming Period: Apr-May

Elevation:
255 - 960 meters
835 - 3150 feet

General Habitats:

Closed-cone coniferous forest
Chaparral
Coastal scrub

Microhabitat Details:

Microhabitat:

Notes

Notes: Known in CA from fewer than ten occurrences near Otay Mtn. Possibly threatened by road construction and Border Patrol activities. Not in The Jepson Manual. See Madroño 16(6):188 (1962) for original description.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	3
	Total EOs	% of EOs
EOs with Threat Listed:	3	33 %
Other	2	22%
Road/trail construction/maint.	2	22%
Improper burning regime	1	11%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					9
A	B	C	D	X	U
3	0	0	0	0	6

Occurrence Status:
Historical >20 Years	5
Recent <=20 Years	4

Presence:
Presumed Extant	9
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
Baja California (BA), California (CA)

California Counties and Islands: Name (Code)
San Diego (SDG)

Quads: Name (Quad Code)
Dulzura (3211667), Otay Mountain (3211657), San Vicente Reservoir (3211688), Tecate (3211656)

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

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CNPS Rare Plant Inventory