Taxon Report

Quercus durata Jeps. var. gabrielensis K. Nixon & C.H. Muller

San Gabriel oak

Print Report

Taxon Summary

Quercus durata var. gabrielensis, commonly known as San Gabriel oak, is a perennial evergreen shrub in the Fagaceae that is found only in California. It occurs within Chaparral, and Cismontane woodland, growing at elevations from 450 to 1000 meters. Quercus durata var. gabrielensis is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.

Classification


Scientific Name:	Quercus durata Jeps. var. gabrielensis K. Nixon & C.H. Muller
Common Name:	San Gabriel oak
Family:	Fagaceae
Element Code:	PDFAG050G2
USDA Plants Symbol:	QUDUG
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial evergreen shrub
Blooming Period: Apr-May	Apr-May
Elevation:	450-1000 (1475-3280)
General Habitats:	Chaparral, Cismontane woodland
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.2
Global Rank:	G4T3
State Rank:	S3
State List:	None
Fed List:	None
Other Status:
CRPR Changes:

Occurrence Data from the CNDDB


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

Location


California Endemic: True
California Counties and Islands: Name (Code)
Los Angeles (LAX), San Bernardino (SBD)
Quads: Name (Quad Code)
Acton (3411842), Agua Dulce (3411843), Azusa (3411728), Burbank (3411823), Chilao Flat (3411831), Condor Peak (3411832), Devore (3411724), Glendora (3411727), Mount San Antonio (3411736), Mt. Baldy (3411726), Mt. Wilson (3411821), Pacifico Mountain (3411841), Pasadena (3411822)

Threat List Data from the CNDDB


Threat List Total:	0
EOs with Threat Listed:	Total EOs	% of EOs
	0	0 %

Notes



Known from the San Gabriel Mtns. Threatened by urbanization and powerline construction. See Novon 4(4):392 (1994) 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 12 July 2025].