Juniperus grandis Woodland Alliance
Mountain juniper woodland

USDA Ecological Section Map

Summary Information

  • Primary Life FormTree
  • Elevation1000-3100 m
  • State RarityS4
  • Global RarityG4
  • DistributionUSA: CA, NV (TJM2)
  • Endemic to CaliforniaNo
  • Endemic to California Floristic Province and DesertsYes
  • Date Added1995/11/01

Characteristic Species

Juniperus grandis is dominant or co-dominant in the tree canopy with Abies concolor, Abies magnifica, Pinus contorta ssp. murrayana, Pinus jeffreyi, Pinus monophylla, Quercus chrysolepis, Quercus garryana and Quercus kelloggii. Or it is emergent above the shrub canopy with Arctostaphylos nevadensis, Artemisia arbuscula, Artemisia tridentata, Cercocarpus ledifolius, Holodiscus discolor or Quercus vacciniifolia.

Vegetation Layers

Trees < 20 m; canopy is open to intermittent or as scattered trees. Shrub layer is sparse to intermittent. Herbaceous layer is sparse or grassy.

Membership Rules

  • Juniperus grandis is conspicuous, but the absolute cover can be as low as 2% when its relative cover is high; Abies concolor, A. magnifica, Pinus contorta ssp. murrayana, or P. jeffreyi may have similar cover in the tree layer (Keeler-Wolf et al. 2003b).

Habitats

Canyon slopes; steep, rocky escarpments; glaciated bedrock.

Other Habitat, Alliance and Community Groupings

MCV (1995) Mountain juniper series
NVCS (2009) Juniperus occidentalis woodland alliance
Calveg Western juniper
Holland Great Basin juniper woodland and scrub
Munz Northern juniper woodland
WHR Juniper
CDFW CA Code 89.200.00

National Vegetation Classification Hierarchy

Formation Class Mesomorphic Tree Vegetation (Forest and Woodland)
Formation Subclass Temperate Forest
Formation Cool Temperate Forest
Division North American Intermountain Basins Scrub Woodland
Macro Group Intermountain Basins Pinyon-Juniper Woodland
Group Western Great Basin montane conifer woodland