Salix jepsonii Shrubland Alliance
Jepson willow thickets

USDA Ecological Section Map

Summary Information

  • Primary Life FormShrub
  • Elevation1000-3400 m
  • State RarityS3
  • Global RarityG3
  • DistributionUSA: CA, NV, OR (TJM2)
  • Endemic to CaliforniaNo
  • Endemic to California Floristic Province and DesertsNo
  • Date Added2009/09/01

Characteristic Species

Salix jepsonii is dominant or co-dominant in the shrub canopy with Acer glabrum, Alnus incana ssp. tenuifolia, Cornus sericea, Lonicera conjugialis, Lonicera involucrata, Paxistima myrsinites, Rhododendron columbianum, Rhododendron occidentale, Ribes montigenum, Ribes nevadense, Rubus parviflorus, Salix geyeriana, Salix lemmonii, Salix lucida ssp. lasiandra, Sambucus racemosa and Spiraea splendens. Emergent trees may be present at low cover, including Abies concolor, Abies magnifica or Pinus contorta ssp. murrayana.

Vegetation Layers

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

Membership Rules

  • Salix jepsonii > 5% absolute cover in the shrub canopy or > 50% relative cover in the shrub canopy (Potter 2005).


Stream banks and flood plains within moderate to very narrow canyons. Soils are alluvium, usually derived from granitic parent materials. The USFWS Wetland Inventory (1996 national list) recognizes Salix jepsonii as an OBL plant.

Other Habitat, Alliance and Community Groupings

MCV (1995) Montane wetland shrub habitat, Subalpine wetland shrub habitat
NVCS (2009) Salix jepsonii seasonally flooded shrubland alliance
Calveg Willow (riparian scrub)
Holland Montane riparian scrub
Munz Not treated
WHR Montane riparian
CDFW CA Code 61.118.00

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