Quercus palmeri Shrubland Alliance
Palmer oak chaparral

USDA Ecological Section Map

Summary Information

  • Primary Life FormShrub
  • Elevation1100-1500 m
  • State RarityS2?
  • Global RarityG3
  • DistributionUSA: AZ, CA, NM. Mexico (TJM2) (USDA Plants)
  • Endemic to CaliforniaNo
  • Endemic to California Floristic Province and DesertsNo
  • Date Added2009/09/01

Characteristic Species

Quercus palmeri is dominant or co-dominant in the shrub canopy with Adenostoma fasciculatum, Adenostoma sparsifolium, Arctostaphylos pungens, Artemisia tridentata, Eriogonum fasciculatum, Eriogonum wrightii, Gutierrezia sarothrae and Yucca schidigera. Emergent trees may be present at low cover, including Pinus jeffreyi or Pinus quadrifolia.

Vegetation Layers

Shrubs < 6 m; canopy is open to continuous and one- or two tiered. Herbaceous layer is sparse to intermittent.

Membership Rules

  • Quercus palmeri > 30% relative cover in the shrub canopy (Klein and Evens 2005).


Dry slopes and ridge tops. Soils are loams.

Other Habitat, Alliance and Community Groupings

MCV (1995) Mixed scrub oak series
NVCS (2009) Not treated
Calveg Scrub oak, Semi-desert chaparral
Holland Semi-desert chaparral, Southern north slope chaparral
Munz Chaparral
WHR Mixed chaparral
CDFW CA Code 37.419.00

National Vegetation Classification Hierarchy

Formation Class Mesomorphic Tree Vegetation (Forest and Woodland)
Formation Subclass Temperate Forest
Formation Warm Temperate Forest
Division Madrean Forest and Woodland
Macro Group California Forest and Woodland
Group Californian broadleaf forest and woodland