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Philadelphus lewisii / Symphoricarpos albus Wet Shrubland
Translated Name: Lewis' Mock Orange / Common Snowberry Wet Shrubland
Unique Identifier: CEGL000875
Classification Approach: International Vegetation Classification (IVC)
Summary: This riparian shrubland association is found across the Columbia Basin of Washington and adjacent Oregon. It usually occurs on the upper stream terraces of permanent streams, although it can occur in the active floodplain of intermittent streams. This is a 2- to 6-m (6- to 20-foot) tall shrubland community dominated by Philadelphus lewisii. A short, sparse shrub layer of Symphoricarpos albus appears with an herbaceous understory of primarily grasses, including Elymus glaucus, Poa pratensis, and Bromus tectorum. Other woody species that may appear abundantly are Toxicodendron rydbergii, Rosa nutkana, and Clematis ligusticifolia. This is the most productive of the currently recognized Philadelphus lewisii types.



Classification

Classification Confidence: Low
Classification Comments: One of Crowe et al.'s (2002) 10 plots of Philadelphus lewisii shrubland is composed of Philadelphus lewisii (25% cover), Symphoricarpos albus (5% cover), Pseudoroegneria spicata (3% cover) and likely fits here. Other plots from Crowe et al. (2002) do not appear to fit the concept of this type. Most of them might best be placed in the broadly defined Philadelphus lewisii Wet Shrubland (CEGL001170). Philadelphus lewisii / Symphoricarpos albus Wet Shrubland (CEGL000875) is found on terraces and appears to be distinct from CEGL001170 found in intermittent stream bottoms. The former type is often degraded, with much Poa pratensis.

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 Netleaf Hackberry / Lewis' Mock Orange Wet Scrub

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

Similar Associations
Unique Identifier Name
CEGL001170 Philadelphus lewisii Wet 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 Philadelphus lewisii / Symphoricarpos albus Shrubland Equivalent Certain IDCDC unpubl. data


Other Related Concepts
Related Concept Name: Philadelphus lewisii / Symphoricarpos
Relationship: = - Equivalent
Reference: Crawford, R. C. 2001. Initial riparian and wetland classification and characterization of the Columbia Basin in Washington. Prepared for Environmental Protection Agency and Bureau of Land Management, Spokane District. Washington Natural Heritage Program, Washington Department of Natural Resources, Olympia. 83 pp.
Related Concept Name: Philadelphus lewisii shrubland
Relationship: B - Broader
Reference: Crowe, E., B. Kovalchik, M. J. Kerr, J. Titus, and J. S. Kagan. 2002. Riparian and wetland plant communities of eastern Oregon. Draft report. Oregon Natural Heritage Information Center, Portland, OR.

Ecological Systems Placement

Ecological Systems Placement
Ecological System Unique ID Ecological System Name
CES304.768 Columbia Basin Foothill Riparian Woodland and Shrubland


NatureServe Conservation Status
Global Status: G1G2 (17Oct2002)
Rounded Global Status: G1 - Critically Imperiled
Reasons: This is an uncommon, minor riparian shrubland found across the Columbia Basin of Washington and adjacent Oregon within a generally degraded riparian landscape. Few examples of representative size and condition are known. Invasive plants, particularly Poa pratensis and Bromus tectorum, alter association composition and structure.

Distribution
Color legend for Distribution Map
United States Distribution: IDpotentially occurs, OR, WA
Global Distribution: United States
Global Range: This riparian shrubland association is found across the Columbia Basin of Washington and adjacent central Oregon. It is probable from southern Idaho.

U.S. Forest Service Ecoregions
Domain Name: Dry Domain
Division Name: Temperate Steppe Division
Province Name: Great Plains-Palouse Dry Steppe Province
Province Code: 331 Occurrence Status: Possible
Section Name: Palouse Prairie Section
Section Code: 331A Occurrence Status: Possible
Division Name: Temperate Desert Division
Province Name: Intermountain Semi-Desert Province
Province Code: 342 Occurrence Status: Confident or certain
Section Name: Columbia Basin Section
Section Code: 342I Occurrence Status: Confident or certain


Vegetation

Vegetation Summary: This is a 2- to 6-m (6- to 20-foot) tall shrubland community dominated by Philadelphus lewisii. A short, sparse shrub layer of Symphoricarpos albus appears with an herbaceous understory of primarily grasses, including Elymus glaucus, Poa pratensis, and Bromus tectorum. Other woody species that may appear abundantly are Toxicodendron rydbergii, Rosa nutkana, and Clematis ligusticifolia. This is the most productive of the currently recognized Philadelphus lewisii types.

Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Charact-
eristic
Dominant Constant
Cover Class %
Con-
stancy
%
Philadelphus lewisii G1 Broad-leaved deciduous shrub Shrub/sapling (tall & short)  
 
 
Symphoricarpos albus G1 Broad-leaved deciduous shrub Short shrub/sapling  
 
 
Bromus tectorum G1 Graminoid Herb (field)    
 
 
Poa pratensis G1 Graminoid Herb (field)    
 
 


Environmental Setting

Wetland Indicator: Y
Environmental Summary: It usually occurs on the upper stream terraces of permanent streams, although it can occur in the active floodplain of intermittent streams.


Dynamic Processes


Plot Sampling & Classification Analysis

Plots stored in VegBank


Authors/Contributors
Concept Author(s): R.C. Crawford
Element Description Edition Date: 17Oct2002
Element Description Author(s): R.C. Crawford
NatureServe Conservation Status Factors Edition Date: 17Oct2002
NatureServe Conservation Status Factors Author(s): R.C. Crawford

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


References
  • Crawford, R. C. 2001. Initial riparian and wetland classification and characterization of the Columbia Basin in Washington. Prepared for Environmental Protection Agency and Bureau of Land Management, Spokane District. Washington Natural Heritage Program, Washington Department of Natural Resources, Olympia. 83 pp.

  • Crowe, E., B. Kovalchik, M. J. Kerr, J. Titus, and J. S. Kagan. 2002. Riparian and wetland plant communities of eastern Oregon. Draft report. Oregon Natural Heritage Information Center, 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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