Salix eastwoodiae Shrubland Alliance
Sierran willow thickets

USDA Ecological Section Map

Summary Information

  • Primary Life FormShrub
  • Elevation2050-3400 m
  • State RarityS3
  • Global RarityG3
  • DistributionUSA: CA, ID, WY (NatureServe)
  • Endemic to CaliforniaNo
  • Endemic to California Floristic Province and DesertsNo
  • Date Added2009/09/01

Characteristic Species

Salix eastwoodiae is dominant in the shrub canopy with Kalmia microphylla, Salix geyeriana, Salix lemmonii, Salix orestera, Salix planifolia and Vaccinium cespitosum. Emergent trees may be present at low cover, including Pinus contorta ssp. murrayana.

Vegetation Layers

Shrubs < 3 m; canopy is intermittent to continuous. Herbaceous layer is open to continuous.

Membership Rules

  • Salix eastwoodiae > 5% cover and dominant in the shrub canopy (Potter 2005).


Subalpine floodplains, drainages in glaciated valleys, gentle slopes adjacent to or along stream banks in seasonally saturated or flooded wet meadows. Soils are sands and organic loams interspersed with bedrock or boulders. The USFWS Wetland Inventory (1996 national list) recognizes Salix eastwoodiae as an OBL plant.

Other Habitat, Alliance and Community Groupings

MCV (1995) Montane wetland shrub habitat, Subalpine wetland shrub habitat
NVCS (2009) Salix eastwoodiae seasonally flooded shrubland alliance
Calveg Willow (riparian scrub)
Holland Montane riparian scrub
Munz Not treated
WHR Wet meadow
CDFW CA Code 61.112.00

National Vegetation Classification Hierarchy

Formation Class Mesomorphic Tree Vegetation (Forest and Woodland)
Formation Subclass Temperate Forest
Formation Temperate Flooded and Swamp Forest
Division Western North America Flooded and Swamp Forest
Macro Group Western Cordilleran montane-boreal riparian scrub
Group Western North American montane-subalpine riparian scrub