Quercus wislizeni (shrub) Shrubland Alliance
Interior live oak chaparral

USDA Ecological Section Map

Summary Information

  • Primary Life FormShrub
  • Elevation300-1850 m
  • State RarityS4
  • Global RarityG4
  • DistributionUSA: CA (NatureServe) (Calflora), Baja California, Mexico (TJM2)
  • Endemic to CaliforniaNo
  • Endemic to California Floristic Province and DesertsYes
  • Date Added1995/11/01

Characteristic Species

Quercus wislizeni is dominant or co-dominant in the shrub canopy with Adenostoma fasciculatum, Arctostaphylos glandulosa, Arctostaphylos glauca, Ceanothus cuneatus, Ceanothus leucodermis, Ceanothus oliganthus, Cercocarpus montanus, Frangula californica, Hesperoyucca whipplei, Heteromeles arbutifolia, Prunus ilicifolia, Quercus berberidifolia, Quercus chrysolepis, Rhamnus ilicifolia and Toxicodendron diversilobum. Emergent trees may be present at low cover, including Aesculus californica, Juniperus californica, Pinus attenuata, Pinus coulteri or Pinus sabiniana.

Vegetation Layers

Shrubs < 6 m; canopy is intermittent to continuous. Herbaceous layer is variable.

Membership Rules

  • Quercus wislizeni shrubs > 30% relative cover with Q. wislizeni dominant or co-dominant with other species in the shrub canopy (Gordon and White 1994, Klein and Evens 2005).


Variable topography with steep slopes. Soils are alluvial or bedrock and may be rocky.

Other Habitat, Alliance and Community Groupings

MCV (1995) Interior live oak shrub series, Interior live oak-canyon live oak series, Interior live oak-chaparral whitethorn series, Interior live oak-scrub live oak series
NVCS (2009) Quercus wislizeni shrubland alliance
Calveg Scrub oak
Holland Interior live oak chaparral, Northern north slope chaparral, Southern north slope chaparral
Munz Chaparral
WHR Mixed chaparral
CDFW CA Code 37.420.00

National Vegetation Classification Hierarchy

Formation Class Mesomorphic Shrub and Herb Vegetation (Shrubland and Grassland)
Formation Subclass Mediterranean Scrub and Grassland
Formation Mediterranean Scrub
Division California Scrub
Macro Group California Chaparral
Group Californian pre-montane chaparral