Quercus wislizeni (tree) Forest & Woodland Alliance
Interior live oak woodland and forest

USDA Ecological Section Map

Summary Information

  • Primary Life FormTree
  • Elevation500-4500 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 var. wislizeni is dominant or co-dominant in the tree canopy with Aesculus californica, Arbutus menziesii, Notholithocarpus densiflorus, Pinus sabiniana, Quercus chrysolepis, Quercus douglasii and Quercus kelloggii.

Vegetation Layers

Trees < 20 m; canopy is intermittent or savanna-like. Shrub layer is open to intermittent. Herbaceous layer is sparse or grassy.

Membership Rules

  • Quercus wislizeni > 50% relative cover, conspicuous, and > 15 % absolute cover in the tree canopy (Klein et al. 2007 ). If other trees are present, they are usually < 50% relative cover (Allen et al. 1989, Evens et al. 2004).


Upland slopes, valley bottoms, terraces. Soils are shallow and moderately to excessively drained.

Other Habitat, Alliance and Community Groupings

MCV (1995) Interior live oak series
NVCS (2009) Quercus wislizeni woodland alliance
Calveg Interior live oak
Holland Interior live oak woodland, Digger pine-oak woodland, Interior live oak forest
Munz Northern oak woodland
WHR Blue oak woodland, Montane hardwood
CDFW CA Code 71.080.00

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