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Crataegus douglasii / Rosa woodsii Wet Shrubland
Translated Name: Black Hawthorn / Woods' Rose Wet Shrubland
Unique Identifier: CEGL001095
Classification Approach: International Vegetation Classification (IVC)
Summary: This association occurs in the Columbia Basin along low-elevation, low-gradient streams with broad floodplains that are flooded seasonally. Due to the low gradients, however, the floodplains are rarely scoured. The association is composed of a partially closed canopy of the broad-leaved, deciduous tall-shrub Crataegus douglasii, which is typically 3-6 m tall. Occasional individuals of the broad-leaved deciduous trees Populus tremuloides, Populus balsamifera ssp. trichocarpa, Betula occidentalis or Alnus incana may occur, but they never dominate the stand. A broad-leaved, deciduous short-shrub layer is present, with varying amounts of cover. Common species include Rosa woodsii, Salix exigua, and Amelanchier alnifolia. The herbaceous layer is composed of perennial grasses, such as Leymus cinereus, Deschampsia cespitosa, and Elymus glaucus. Some Carex species do occur.



Classification

Classification Confidence: Moderate
Classification Comments: This association is poorly described in the literature, without data for canopy cover or species composition.

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 Valley Bottom Black Hawthorn / Common Snowberry Wet Shrubland

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

Similar Associations
Unique Identifier Name
CEGL001093 Crataegus douglasii - (Crataegus chrysocarpa) Shrubland



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These data are subject to substantial ongoing revision and may be out of date for some states.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 Crataegus douglasii / Rosa woodsii Shrubland Equivalent Certain IDCDC 2005
Oregon Crataegus douglasii - Rosa woodsii Equivalent Certain Kagan et al. 2004


Other Related Concepts
Related Concept Name: Crataegus douglasii - Rosa woodsii 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]
Related Concept Name: Crataegus douglasii / Rosa woodsii Association
Relationship: = - Equivalent
Reference: Evans, S. 1989a. Riparian survey of Washington's Columbia Basin. Unpublished report prepared for The Nature Conservancy Washington Natural Heritage Program, Olympia, Washington.
Related Concept Name: Crataegus douglasii / Rosa woodsii community type
Relationship: = - Equivalent
Reference: Crawford, R. C. 2003. Riparian vegetation classification of the Columbia Basin, Washington. Natural Heritage Report 2003-03. Washington Natural Heritage Program, Washington Department of Natural Resources, Olympia. 98 pp. plus appendices.
Related Concept Name: Douglas hawthorn association
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.

Ecological Systems Placement

Ecological Systems Placement
Ecological System Unique ID Ecological System Name
CES304.768 Columbia Basin Foothill Riparian Woodland and Shrubland
CES306.994 Northern Rocky Mountain Montane-Foothill Deciduous Shrubland


NatureServe Conservation Status
Global Status: G2 (28Apr2000)
Rounded Global Status: G2 - Imperiled
Reasons: This plant association was formerly widespread in eastern Oregon and Washington, primarily in the Columbia Basin and the Blue Mountains of southeastern Washington, northeastern Oregon and west-central Idaho. Stands of this association are extremely sensitive to grazing, and in many areas of its former distribution, stands have been destroyed. Exotic grass species are common in the understories of most Crataegus stands and may include Phleum pratense, Poa pratensis, Bromus tectorum, Bromus inermis, and Schedonorus arundinaceus. Continued threats include water development, livestock grazing, and agricultural activities.

Distribution
Color legend for Distribution Map
United States Distribution: ID, OR, WA
Global Distribution: United States
Global Range: Formerly widespread in eastern Oregon and Washington, primarily in the Columbia Basin and the Blue Mountains of southeastern Washington, northeastern Oregon and west-central Idaho. Now occurs as just a few scattered occurrences in this range.

U.S. Forest Service Ecoregions
Domain Name: Dry Domain
Division Name: Temperate Desert Division
Province Name: Intermountain Semi-Desert Province
Province Code: 342 Occurrence Status: Confident or certain
Section Name: Northwestern Basin and Range Section
Section Code: 342B Occurrence Status: Possible
Section Name: Owyhee Uplands Section
Section Code: 342C Occurrence Status: Possible
Section Name: High Lava Plains Section
Section Code: 342H Occurrence Status: Confident or certain
Section Name: Columbia Basin Section
Section Code: 342I Occurrence Status: Confident or certain
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: Idaho Batholith Section
Section Code: M332A Occurrence Status: Confident or certain
Section Name: Blue Mountains Section
Section Code: M332G Occurrence Status: Confident or certain


Vegetation

Vegetation Summary: This association is poorly described, without data for canopy cover or detailed species composition. It is composed of a partially closed canopy of the broad-leaved deciduous tall-shrub Crataegus douglasii, which is typically 3-6 m tall. Occasional individuals of the broad-leaved deciduous trees Populus tremuloides, Populus balsamifera ssp. trichocarpa (= Populus trichocarpa), Betula occidentalis, or Alnus incana may occur, but they never dominate the stand. A broad-leaved deciduous short-shrub layer is present, with varying amounts of cover. Common species include Rosa woodsii, Salix exigua, and Amelanchier alnifolia. The herbaceous layer is composed of perennial grasses, such as Leymus cinereus (= Elymus cinereus), Deschampsia cespitosa, and Elymus glaucus. Some Carex species do occur. Many weedy introduced grasses are common in the understories of most Crataegus stands. These can include Phleum pratense, Poa pratensis, Bromus tectorum, Bromus inermis, and Schedonorus arundinaceus (= Festuca arundinacea).

Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Charact-
eristic
Dominant Constant
Cover Class %
Con-
stancy
%
Salix exigua G2 Broad-leaved deciduous shrub Shrub/sapling (tall & short)    
 
 
Crataegus douglasii G2 Broad-leaved deciduous shrub Tall shrub/sapling  
 
 
Rosa woodsii G2 Dwarf-shrub Short shrub/sapling    
 
 
Bromus inermis G2 Graminoid Herb (field)      
 
 
Bromus tectorum G2 Graminoid Herb (field)      
 
 
Leymus cinereus G2 Graminoid Herb (field)    
 
 
Lolium arundinaceum G2 Graminoid Herb (field)      
 
 
Phleum pratense G2 Graminoid Herb (field)      
 
 
Poa pratensis G2 Graminoid Herb (field)      
 
 


Vegetation Structure
Stratum Growth Form
Height of Stratum (m)
Cover
Class
%
Min
Cover %
Max
Cover %
Tall shrub/sapling Broad-leaved deciduous shrub
 
 
 
 
Short shrub/sapling Broad-leaved deciduous shrub
 
 
 
 
Herb (field) Flowering forb
 
 
 
 


Environmental Setting

Wetland Indicator: Y
Environmental Summary: This association occurs in the Columbia Basin, a downwarped, basalt-floored region. Loess is thick in some portions of the region, and alluvial deposits of variable parent materials are patchy along streams and rivers. Thick mantles of sands from periodically glacially dammed lakes cover some portions of the region. In other areas, valleys and canyons (coulees) have been deeply scoured into the basalt by glacial flooding.

The climate of the region is characterized by a mix of continental and maritime influences. It is in the rainshadow of the Cascades, with annual precipitation between 9 and 20 inches. Between 55% and 75% of the precipitation falls during October through March as snow, and summers are typically dry. Summer temperatures can be hot, and winters are typically cold.

This association is found on riparian sites of low-elevation, low-gradient streams with broad floodplains. These sites are flooded seasonally, but due to the low gradients are rarely scoured. Soils are typically deep and fine-textured.


Dynamic Processes


Plot Sampling & Classification Analysis

Plots stored in VegBank


Authors/Contributors
Concept Author(s): M.S. Reid
Element Description Edition Date: 27Jan1994
Element Description Author(s): M.S. Reid and M. Jankovsky-Jones
NatureServe Conservation Status Factors Edition Date: 18Nov1998
NatureServe Conservation Status Factors Author(s): M.S. Reid, M. Jankovsky-Jones

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.

  • Crawford, R. C. 2003. Riparian vegetation classification of the Columbia Basin, Washington. Natural Heritage Report 2003-03. Washington Natural Heritage Program, Washington Department of Natural Resources, Olympia. 98 pp. plus appendices.

  • 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]

  • Evans, S. 1989a. Riparian survey of Washington's Columbia Basin. Unpublished report prepared for The Nature Conservancy Washington Natural Heritage Program, Olympia, Washington.

  • 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.

  • ORNHP [Oregon Natural Heritage Program]. No date. Unpublished data files. Oregon Natural Heritage Program, The Nature Conservancy, Portland, OR.

  • 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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