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Alnus incana / Spiraea douglasii Wet Shrubland
Translated Name: Gray Alder / Rose Spirea Wet Shrubland
Unique Identifier: CEGL001152
Classification Approach: International Vegetation Classification (IVC)
Summary: This association occurs in Washington, Oregon and California. This riparian tall-shrub (or small-tree) community is common in eastern Oregon at elevations of 670-1740 m (2200-5700 feet). Stands are found on a variety of riparian fluvial surfaces. Soil textures vary from loam to sandy loam grading into cobbles and gravels. Soils are well-drained, but remain wet-moist because of the proximity of water. The shrub canopy is dominated by Alnus incana and Spiraea douglasii. Forb cover is typified by Maianthemum stellatum, Galium triflorum, and Achillea millefolium. Important graminoids are Carex angustata, Glyceria striata, and Carex disperma. Athyrium filix-femina is also common.



Classification

Classification Confidence: Low
Classification Comments: This association is defined as a PNV vegetation type. Identified in a recent classification of about 2000 plots throughout eastern Oregon and probably western Idaho.

Vegetation Hierarchy
Class 2 - Shrub & Herb Vegetation
Subclass 2.C - Shrub & Herb Wetland
Formation 2.C.4 - Temperate to Polar Freshwater Marsh, Wet Meadow & Shrubland
Division 2.C.4.Nb - Western North American Temperate & Boreal Freshwater Marsh, Wet Meadow & Shrubland
Macrogroup Western North American Montane Marsh, Wet Meadow & Shrubland
Group Western Montane-Subalpine Riparian & Seep Shrubland
Alliance Western Alder Wet Shrubland

This is the revised vegetation hierarchy. For more information see Classification Sources and usnvc.org.



Related Concepts from Other Classifications

Related Subnational Community Units
These data are subject to substantial ongoing revision and may be out of date for some states.
In the U.S., contact the state Heritage Program for the most complete and up-to-date information at: http://www.natureserve.org/natureserve-network.
Information from programs in other jurisdictions will be posted when they are made available.
Subnation Concept Name Relationship to Standard Confidence Reference
Idaho Alnus incana / Spiraea douglasii Shrubland Equivalent Certain IDCDC 2005
Oregon Alnus incana - Spiraea douglasii Equivalent Certain Kagan et al. 2004


Other Related Concepts
Related Concept Name: Alnus incana - Spiraea douglasii
Relationship: = - Equivalent
Reference: Kovalchik, B. L. 1987. Riparian zone associations - Deschutes, Ochoco, Fremont, and Winema national forests. Technical Paper 279-87. USDA Forest Service, Pacific Northwest Region, Portland, OR. 171 pp.
Related Concept Name: Alnus incana - Spiraea douglasii Association
Relationship: = - Equivalent
Reference: Crowe, E. A., B. L. Kovalchik, and M. J. Kerr. 2004. Riparian and wetland vegetation of central and eastern Oregon. Oregon Natural Heritage Information Center, Institute for Natural Resources, Oregon State University, Portland. 473 pp. [http://oregonstate.edu/ornhic/ publications.html]
Relationship: = - Equivalent
Reference: Kovalchik, B. L. 1993. Riparian plant associations on the national forests of eastern Washington - Draft version 1. USDA Forest Service, Colville National Forest, Colville, WA. 203 pp.

Ecological Systems Placement

Ecological Systems Placement
Ecological System Unique ID Ecological System Name
CES204.866 North Pacific Montane Riparian Woodland and Shrubland
CES306.832 Rocky Mountain Subalpine-Montane Riparian Shrubland


NatureServe Conservation Status
Global Status: G3 (25Apr2000)
Rounded Global Status: G3 - Vulnerable
Reasons: This community is fairly widespread but not very abundant. As with most riparian communities, it is threatened by grazing and water diversions. Only one known site is currently protected. However, efforts to protect salmon are helping to improve conditions for this type.

Distribution
Color legend for Distribution Map
United States Distribution: CA, ID, OR, WA
Global Distribution: United States
Global Range: Described from eastern Oregon and Washington from mid elevations in the mountains, California, and assumed to be present in adjacent Idaho.

U.S. Forest Service Ecoregions
Domain Name: Humid Temperate Domain
Division Name: Marine Regime Mountains
Province Name: Cascade Mixed Forest - Coniferous Forest - Alpine Meadow Province
Province Code: M242 Occurrence Status: Confident or certain
Section Name: Eastern Cascades Section
Section Code: M242C Occurrence Status: Confident or certain
Division Name: Mediterranean Regime Mountains
Province Name: Sierran Steppe - Mixed Forest - Coniferous Forest - Alpine Meadow Province
Province Code: M261 Occurrence Status: Confident or certain
Section Name: Klamath Mountains Section
Section Code: M261A Occurrence Status: Confident or certain
Section Name: Southern Cascades Section
Section Code: M261D Occurrence Status: Confident or certain
Section Name: Sierra Nevada Section
Section Code: M261E Occurrence Status: Confident or certain
Domain Name: Dry Domain
Division Name: Temperate Steppe Regime Mountains
Province Name: Middle Rocky Mountain Steppe - Coniferous Forest - Alpine Meadow Province
Province Code: M332 Occurrence Status: Confident or certain
Section Name: Blue Mountains Section
Section Code: M332G Occurrence Status: Confident or certain
Province Name: Northern Rocky Mountain Forest - Steppe - Coniferous Forest - Alpine Meadow Province
Province Code: M333 Occurrence Status: Confident or certain
Section Name: Okanogan Highlands Section
Section Code: M333A Occurrence Status: Confident or certain


Vegetation

Vegetation Summary: The shrub canopy is dominated by Alnus incana (42% cover) and Spiraea douglasii (18% cover). Forb cover averages 29%, and is typified by Maianthemum stellatum (4%), Galium triflorum (2%), and Achillea millefolium (1%). Important graminoids are Carex angustata (= Carex eurycarpa) (5%), Glyceria striata (= Glyceria elata) (4%), and Carex disperma (3%). Athyrium filix-femina (2%) is also common.

Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Charact-
eristic
Dominant Constant
Cover Class %
Con-
stancy
%
Alnus incana G3 Broad-leaved deciduous shrub Tall shrub/sapling  
 
 
Spiraea douglasii G3 Broad-leaved deciduous shrub Short shrub/sapling  
 
 


Environmental Setting

Wetland Indicator: Y
Environmental Summary: This riparian tall-shrub (or small-tree) community is common in eastern Oregon at elevations of 670-1740 m (2200-5700 feet). Stands are found on a variety of riparian fluvial surfaces. Soil textures vary from loam to sandy loam grading into cobbles and gravels. Soils are well-drained, but remain wet-moist because of the proximity of water.


Dynamic Processes


Plot Sampling & Classification Analysis

Plots stored in VegBank


Authors/Contributors
Concept Author(s): M.P. Murray
Element Description Edition Date: 26Nov1997
Element Description Author(s): M.P. Murray
NatureServe Conservation Status Factors Edition Date: 20Oct1999
NatureServe Conservation Status Factors Author(s): M.P. Murray

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


References
  • Bourgeron, P. S., and L. D. Engelking, editors. 1994. A preliminary vegetation classification of the western United States. Unpublished report. The Nature Conservancy, Western Heritage Task Force, Boulder, CO. 175 pp. plus appendix.

  • Crowe, E. A., B. L. Kovalchik, and M. J. Kerr. 2004. Riparian and wetland vegetation of central and eastern Oregon. Oregon Natural Heritage Information Center, Institute for Natural Resources, Oregon State University, Portland. 473 pp. [http://oregonstate.edu/ornhic/ publications.html]

  • IDCDC [Idaho Conservation Data Center]. 2005. Wetland and riparian plant associations in Idaho. Idaho Conservation Data Center, Idaho Department of Fish and Game, Boise. [http://fishandgame.idaho.gov/tech/CDC/ecology/wetland_riparian_assoc.cfm] (accessed 14 June 2005).

  • Kagan, J. S., J. A. Christy, M. P. Murray, and J. A. Titus. 2004. Classification of native vegetation of Oregon. January 2004. Oregon Natural Heritage Information Center, Portland. 52 pp.

  • Kovalchik, B. L. 1987. Riparian zone associations - Deschutes, Ochoco, Fremont, and Winema national forests. Technical Paper 279-87. USDA Forest Service, Pacific Northwest Region, Portland, OR. 171 pp.

  • Kovalchik, B. L. 1993. Riparian plant associations on the national forests of eastern Washington - Draft version 1. USDA Forest Service, Colville National Forest, Colville, WA. 203 pp.

  • WNHP [Washington Natural Heritage Program]. 2018. Unpublished data files. Washington Natural Heritage Program, Department of Natural Resources, Olympia, WA.

  • Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.


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Data last updated: March 2019