Acer glabrum Provisional Shrubland Alliance
Rocky Mountain maple thickets

Summary Information

  • Primary Life FormShrub
  • Elevation1500-2800 m
  • State RarityS3?
  • Global RarityG5
  • DistributionUSA: CA, OR?, NV?, MT, WY (NatureServe)
  • Endemic to CaliforniaNo
  • Endemic to California Floristic Province and DesertsNo
  • Date Added2009/09/01

Characteristic Species

Acer glabrum is dominant or co-dominant in the shrub canopy with Alnus incana ssp. tenuifolia, Alnus viridis ssp. sinuata, Cornus sericea, Paxistima myrsinites, Sambucus nigra and Sorbus scopulina.

Vegetation Layers

Emergent, avalanche-damaged conifers may be present. Shrubs < 5 m: canopy is continuous. Herbaceous layer is variable and possibly diverse.


Along streambanks, edges of the avalanche tracks, and other mesic disturbance zones. The USFWS Wetland Inventory (1996 national list) recognizes Acer glabrum var. torreyi as a FAC plant.

Other Habitat, Alliance, and Community Groupings

MCV (1995) Montane wetland shrub habitat
NVCS (2009) Acer glabrum shrubland alliance
Calveg Not treated
Holland Montane riparian scrub
Munz Red fir forest
WHR Montane riparian
CDFW CA Code 61.430.00