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Celtis laevigata var. reticulata / Philadelphus lewisii Wet Scrub
Translated Name: Netleaf Hackberry / Lewis' Mock Orange Wet Scrub
Unique Identifier: CEGL000792
Classification Approach: International Vegetation Classification (IVC)
Summary: This is a riparian shrubland or short woodland community known only in the vicinity of the common border of Oregon, Washington, and Idaho along the Snake River and tributaries. This type is typically found on upper stream terraces, although it can occur on toeslopes or in the active floodplain. Generally this association follows the distribution of Alnus rhombifolia but extends into drier climates and riparian sites than Alnus rhombifolia. Incomplete surveys indicate this association may occur or occurred in the dry end (east) of the Columbia River Gorge in Washington. Short Celtis laevigata var. reticulata trees, 3 to 6 m (10-20 feet) tall, form a dense to open canopy with shrubby undergrowth with Philadelphus lewisii. Shrub layer often contains Sambucus nigra ssp. cerulea, Rosa woodsii, or Rosa nutkana. Toxicodendron rydbergii is more abundant on moist sites and with more sampling may represent a different association. Exotic herbaceous plants are frequent in this association. Bromus tectorum is common and can be very abundant on recently disturbed sites. The exotic herb Anthriscus caucalis is the most common forb species. Associated herbaceous species are typically drier riparian species and often are increasers with ground disturbance. As conceptualized, this type currently includes all Celtis laevigata var. reticulata communities with Philadelphus lewisii that are associated with riparian environments. It is distinct from the more open upland/toeslope Celtis laevigata var. reticulata / Pseudoroegneria spicata Wet Scrub (CEGL001085).



Classification

Classification Confidence: Low

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
CEGL001085 Celtis laevigata var. reticulata / Pseudoroegneria spicata Wet Scrub
CEGL003451 Celtis laevigata var. reticulata / Toxicodendron rydbergii Wet Scrub



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 Celtis laevigata var. reticulata / Philadelphus lewisii Woodland Equivalent Certain IDCDC unpubl. data


Other Related Concepts
Related Concept Name: Celtis laevigata var. reticulata - Philadelphus lewisii 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: Celtis reticulata / Philadelphus lewisii
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: Celtis reticulata / Rhus radicans
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: G1 (17Oct2002)
Rounded Global Status: G1 - Critically Imperiled
Reasons: A narrow endemic association that is known only from tributary streams of the Snake River in Oregon and Washington. This riparian association appears in a region with abundant exotic plant species that invade and alter native composition and structure. Much of this range is adjacent to reservoir water. Most occurrences are or have been heavily used by livestock and native ungulates for shade and tend to become very weedy with exotic annuals or in some areas invaded by the exotic shrub Rubus armeniacus. Only isolated small pockets are in good condition. Fewer than 10 locations are known.

Distribution
Color legend for Distribution Map
United States Distribution: IDpotentially occurs, OR, WA
Global Distribution: United States
Global Range: This association is reported from the Hells Canyon area of the Snake River and its tributaries in Idaho, Oregon and Washington. It is reported as disjunct in the east end of Columbia River Gorge of Washington, and in the lower portions of the John Day River Canyon in Oregon. Its occurrence in Idaho is uncertain.

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: Confident or certain
Section Name: Palouse Prairie Section
Section Code: 331A 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: Blue Mountains Section
Section Code: M332G Occurrence Status: Confident or certain


Vegetation

Vegetation Summary: Short Celtis laevigata var. reticulata trees, 3 to 6 m (10-20 feet) tall, form a dense to open canopy with shrubby undergrowth with Philadelphus lewisii. Shrub layer often contains Sambucus nigra ssp. cerulea, Rosa woodsii, or Rosa nutkana. Toxicodendron rydbergii is more abundant on moist sites and with more sampling may represent a different association. Exotic herbaceous plants are frequent in this association. Bromus tectorum is common and can be very abundant on recently disturbed sites. The exotic herb Anthriscus caucalis is the most common forb species. Associated herbaceous species are typically drier riparian species and often are increasers with ground disturbance. As conceptualized this type currently includes all Celtis laevigata var. reticulata communities with Philadelphus lewisii that are associated with riparian environments. It is distinct from the more open upland/toeslope Celtis laevigata var. reticulata / Pseudoroegneria spicata Wet Scrub(CEGL001085).

Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Charact-
eristic
Dominant Constant
Cover Class %
Con-
stancy
%
Celtis laevigata var. reticulata G1 Broad-leaved deciduous tree Tree canopy  
 
 
Philadelphus lewisii G1 Broad-leaved deciduous shrub Tall shrub/sapling  
 
 
Anthriscus caucalis G1 Flowering forb Herb (field)    
 
 
Bromus tectorum G1 Graminoid Herb (field)    
 
 


Environmental Setting

Wetland Indicator: Y
Environmental Summary: This type is typically found on upper stream terraces, although it can occur on toeslopes or in the active floodplain. Generally this association follows the distribution of Alnus rhombifolia but extends into drier climates and riparian sites than Alnus rhombifolia. Incomplete surveys indicate this association may occur or occurred in the dry end (east) of the Columbia River Gorge in Washington.


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. 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]

  • 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.

  • Erixson, J., and D. Cogan. 2012c. Vegetation inventory project report: Nez Perce National Historical Park. Natural Resource Report NPS/UCBN/NRR--2012/531. National Park Service, Fort Collins, CO. 380 pp.

  • Miller, T. B. 1976. Ecology of riparian communities dominated by white alder in western Idaho. Unpublished thesis, University of Idaho, Moscow. 154 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