Pinus ponderosa var. washoensis Woodland Alliance
Washoe pine woodland

USDA Ecological Section Map

Summary Information

  • Primary Life FormTree
  • Elevation1900-2200 m
  • State RarityS2.2
  • Global RarityG2
  • DistributionUSA: CA, NV, OR, WA? (TJM2)
  • Endemic to CaliforniaNo
  • Endemic to California Floristic Province and DesertsNo
  • Date Added1995/11/01

Characteristic Species

Pinus ponderosa var. washoensis is dominant in the tree canopy with Abies concolor, Abies magnifica, Calocedrus decurrens, Juniperus grandis, Juniperus occidentalis, Pinus contorta ssp. murrayana, Pinus jeffreyi, Pinus lambertiana, Pinus monticola, Pinus ponderosa and Populus tremuloides.

Vegetation Layers

Trees < 35 m; canopy is open to intermittent. Shrub layer is sparse to intermittent. Herbaceous layer is grassy.

Membership Rules

  • Pinus washoensis > 50% relative cover in tree canopy and present in regeneration layer (Smith 1994).


Primarily on upper slopes of granitic or volcanic substrates.

Other Habitat, Alliance and Community Groupings

MCV (1995) Washoe pine series
NVCS (2009) Pinus washoensis woodland alliance
Calveg Eastside pine, Ponderosa pine, Washoe pine
Holland Washoe pine-fir forest
Munz Yellow pine forest
WHR Eastside pine
CDFW CA Code 87.120.00

National Vegetation Classification Hierarchy

Formation Class Mesomorphic Tree Vegetation (Forest and Woodland)
Formation Subclass Temperate Forest
Formation Cool Temperate Forest
Division Western North America Cool Temperate Forest
Macro Group Californian-Vancouverian Montane and Foothill Forest
Group Californian montane conifer forest