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Classification
Scientific Name: Inter-Mountain Basins Curl-leaf Mountain-mahogany Woodland and Shrubland
Unique Identifier: CES304.772
Classification Confidence: 2 - Moderate

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Summary: This ecological system occurs in hills and mountain ranges of the Intermountain West basins from the eastern foothills of the Sierra Nevada northeast to the foothills of the Bighorn Mountains. It typically occurs from 600 m to over 2650 m in elevation on rocky outcrops or escarpments and forms small- to large-patch stands in forested areas. Most stands occur as shrublands on ridges and steep rimrock slopes, but they may be composed of small trees in steppe areas. Scattered junipers or pines may also occur. This system includes both woodlands and shrublands dominated by Cercocarpus ledifolius. Artemisia tridentata ssp. vaseyana, Purshia tridentata, with species of Arctostaphylos, Ribes, or Symphoricarpos are often present. Undergrowth is often very sparse and dominated by bunchgrasses, usually Pseudoroegneria spicata and Festuca idahoensis. Cercocarpus ledifolius is a slow-growing, drought-tolerant species that generally does not resprout after burning and needs the protection from fire that rocky sites provide.

Classification Approach: International Terrestrial Ecological Systems Classification (ITESC)


Component Associations
Association Unique ID Association Name
CEGL000960 Cercocarpus ledifolius / Artemisia tridentata Woodland
CEGL000961 Cercocarpus ledifolius / Calamagrostis rubescens Woodland
CEGL000962 Cercocarpus ledifolius / Festuca idahoensis Woodland
CEGL000963 Cercocarpus ledifolius / Holodiscus dumosus Woodland
CEGL000964 Cercocarpus ledifolius / Leymus salinus ssp. salmonis Woodland
CEGL000965 Cercocarpus ledifolius / Mahonia repens Scrub
CEGL000966 Cercocarpus ledifolius / Prunus virginiana Scrub
CEGL000967 Cercocarpus ledifolius / Pseudoroegneria spicata Scrub
CEGL000968 Cercocarpus ledifolius / Pseudoroegneria spicata - Festuca idahoensis Woodland
CEGL000969 Cercocarpus ledifolius / Symphoricarpos longiflorus Scrub
CEGL000970 Cercocarpus ledifolius / Symphoricarpos oreophilus Woodland
CEGL001022 Cercocarpus ledifolius / Artemisia tridentata ssp. vaseyana Woodland
CEGL001487 Artemisia arbuscula - Cercocarpus ledifolius / Pseudoroegneria spicata - Poa secunda Scrub
CEGL005359 Cercocarpus ledifolius / Quercus gambelii Woodland



Classifiers

Land Cover Class: Forest and Woodland
Spatial Pattern: Large patch
Natural/Seminatural: No
Vegetated ( > 10% vascular cover):
Upland: Yes
Wetland: No
Isolated Wetland: No

Diagnostic Classifiers
Primary Classifier Secondary Classifier
Montane Lower Montane
Lowland Foothill
Aridic  
Cercocarpus ledifolius  

Non-diagnostic Classifiers
Primary Classifier Secondary Classifier
Forest and Woodland (Treed)  
Shrubland (Shrub-dominated)  
Foothill(s)  
Piedmont  
Plateau  
Ridge/Summit/Upper Slope  
Sideslope  
Temperate Temperate Continental
Long Disturbance Interval  
F-Patch/Medium Intensity  

At-Risk Species Reported for this Ecological System
Scientific Name
  (Common Name)
NatureServe Global Status U.S. Endangered Species Act Status
Ericameria crispa
  (Pine Valley Goldenbush)
G2  
Penstemon leiophyllus var. francisci-pennellii
  (Charleston Beardtongue)
G3T2  
Phacelia cookei
  (Cooke's Phacelia)
G1  
Phacelia monoensis
  (Mono County Phacelia)
G3  
Pyrrocoma carthamoides var. subsquarrosa
  (Large-flower Goldenweed)
G4G5T3  

Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Char-
acter-
istic
Domi-nant Con-stant
Cover Class %
Con-
stancy
%
Quercus gambelii G5 Broad-leaved deciduous shrub Shrub/sapling (tall & short)    
 
 
Ribes cereum G5 Broad-leaved deciduous shrub Shrub/sapling (tall & short)    
 
 
Symphoricarpos oreophilus G5 Broad-leaved deciduous shrub Shrub/sapling (tall & short)    
 
 
Artemisia tridentata ssp. vaseyana T4 Broad-leaved evergreen shrub Shrub/sapling (tall & short)    
 
 
Cercocarpus ledifolius G5 Broad-leaved evergreen shrub Shrub/sapling (tall & short)    
 
 
Purshia tridentata G4 Broad-leaved evergreen shrub Shrub/sapling (tall & short)    
 
 
Ericameria crispa G2 Broad-leaved deciduous shrub Short shrub/sapling      
 
 
Penstemon leiophyllus var. francisci-pennellii T2 Flowering forb Herb (field)      
 
 
Phacelia cookei G1 Flowering forb Herb (field)      
 
 
Phacelia monoensis G3 Flowering forb Herb (field)      
 
 
Pyrrocoma carthamoides var. subsquarrosa T3 Flowering forb Herb (field)      
 
 
Festuca idahoensis G5 Graminoid Herb (field)  
 
 
Pseudoroegneria spicata G5 Graminoid Herb (field)    
 
 
Pseudoroegneria spicata ssp. spicata T5 Graminoid Herb (field)    
 
 


Animal Species Reported for this Ecological System
Scientific Name
  (Common Name)
Global Status U.S. Endangered Species Act Status Charact-
eristic
Exotic
Accipiter striatus
  (Sharp-shinned Hawk)
G5      
Artemisiospiza belli
  (Bell's Sparrow)
G5      
Callospermophilus lateralis
  (Golden-mantled Ground Squirrel)
G5      
Oreothlypis virginiae
  (Virginia's Warbler)
G5      
Pipilo chlorurus
  (Green-tailed Towhee)
G5      
Pituophis catenifer
  (Gophersnake)
G5      
Rhinocheilus lecontei
  (Long-nosed Snake)
G5      
Sceloporus graciosus
  (Sagebrush Lizard)
G5      
Spizella breweri
  (Brewer's Sparrow)
G5      
Vireo vicinior
  (Gray Vireo)
G5      


Distribution
Color legend for Distribution Map
Nation: United States
United States Distribution: CA, CO, ID, MT, NV, OR, UT, WA, WY
Global Range: This system occurs in hills and mountain ranges of the Intermountain West basins from the eastern foothills of the Sierra Nevada northeast to the foothills of the Bighorn Mountains.

Biogeographic Divisions
Division Code and Name Primary Occurrence Status
206-Mediterranean California ?: Possible
304-Inter-Mountain Basins C: Confident or certain
306-Rocky Mountain C: Confident or certain

The Nature Conservancy's Conservation Ecoregions
Code Name Occurrence Status
10 Wyoming Basins Predicted or probable
11 Great Basin Confident or certain
12 Sierra Nevada Confident or certain
6 Columbia Plateau Predicted or probable
9 Utah-Wyoming Rocky Mountains Confident or certain

MRLC 2000 Mapzones
Code Name Occurrence Status
2 Oregon Coastal Range Confident or certain
6 Sierra Nevada Mountain Range Predicted or probable
7 Cascade Mountain Range Confident or certain
8 Grande Coulee Basin of the Columbia Plateau Confident or certain
9 Blue Mountain Region Confident or certain
10 Northwestern Rocky Mountains Confident or certain
12 Western Great Basin Confident or certain
16 Utah High Plateaus Confident or certain
17 Eastern Great Basin Confident or certain
18 Snake River Plain Confident or certain
19 Northern Rocky Mountains Confident or certain
20 Missouri River Plateau Never was there
21 Middle Rocky Mountains Confident or certain
22 Wyoming Basin Confident or certain
23 Colorado Plateau Possible
29 Wyoming Highlands Confident or certain
30 Northwestern Great Plains Possible

National Mapping
ESLF Code (Ecological System Lifeform): 4303
ESP Code (Environmental Site Potential): 1062
EVT Code (Existing Vegetation Type): 2062

West Landfire Legend: Yes
East Landfire Legend: No

Authors/Contributors
Element Description Edition Date: 02Apr2014
Element Description Author(s): M.S. Reid and G. Kittel

Ecological data developed by NatureServe and its network of natural heritage programs (see Local Programs) and other contributors and cooperators (see Sources).


References
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