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Leymus triticoides - Poa secunda Wet Meadow
Translated Name: Beardless Wildrye - Sandberg Bluegrass Wet Meadow
Unique Identifier: CEGL001572
Classification Approach: International Vegetation Classification (IVC)
Summary: This is an alkaline grassland described from the Warner Basin of Oregon, but seen in the Guano and Catlow valleys of south-central Oregon, from Inyo County, California, and almost certainly found elsewhere in the northern Basin and Range and likely occurs in Nevada. It is found in flat, alkaline wetlands, associated with playa lakes, or rarely seasonal streams. In Oregon, elevations range from 1220-1525 m (4000-5000 feet) in elevation. Leymus triticoides is the characteristic plant, with Poa secunda (= Poa juncifolia and sometimes still considered as Poa secunda ssp. juncifolia) usually codominant. In the more alkaline areas, Distichlis spicata or Puccinellia spp. can be found, although the most alkaline expressions should be considered a different association. These moist, playa grasslands are distinctive in the very high, predominately rhizomatous grass cover, with frequencies of Leymus triticoides averaging over 85%.



Classification

Classification Confidence: Low - Poorly Documented
Classification Comments: While this is clearly a distinct habitat, the name is based on limited sampling. Kagan observed this in Warner Basin inventories in 1982. Odion et al. (1992) describe this from Inyo County, California.

Easterday and Mamone (1980) described three more alkaline Leymus triticoides associations (Elymus triticoides - Distichlis stricta, Elymus triticoides - Juncus balticus, and Elymus triticoides - Juncus balticus - Triglochin maritima) from the Warner Basin. These more alkaline types are not included in the regional classification, although on the basis of this review, it has been lumped as Leymus triticoides - Juncus balticus alkaline wetland in the Oregon classification, which recommends them as additions from Oregon and California. The distribution of either of the Leymus triticoides associations in Nevada must be determined.

The alliance placement of this type is probably wrong. It is a probably an intermittently flooded grassland.


Vegetation Hierarchy
Class 2 - Shrub & Herb Vegetation
Subclass 2.C - Shrub & Herb Wetland
Formation 2.C.5 - Salt Marsh
Division 2.C.5.Nd - North American Western Interior Brackish Marsh, Playa & Shrubland
Macrogroup Warm & Cool Desert Alkali-Saline Marsh, Playa & Shrubland
Group North American Desert Alkaline-Saline Marsh & Playa
Alliance Western Wildrye Alkaline Wet Meadow

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
Nevada Leymus triticoides - Poa secunda Herbaceous Vegetation Equivalent Certain Peterson 2008
Oregon Leymus triticoides - Poa secunda ssp. juncifolia Equivalent Certain Kagan et al. 2004


Other Related Concepts
Related Concept Name: Elymus triticoides - Distichlis stricta
Relationship: F - Finer
Reference: Easterday, J. C., and M. S. Mamone. 1980. Vegetation of Warner Valley. Pages 3-66 in: C. Gilman, project director. Analysis of the aquatic habitats of Warner Valley with relation to land use patterns. Final report. National Science Foundation Grant SPI-78-03490. Department of Fisheries and Wildlife, Oregon State University, Corvallis. 175 pp.
Related Concept Name: Elymus triticoides - Juncus balticus - Triglochin maritima
Relationship: F - Finer
Reference: Easterday, J. C., and M. S. Mamone. 1980. Vegetation of Warner Valley. Pages 3-66 in: C. Gilman, project director. Analysis of the aquatic habitats of Warner Valley with relation to land use patterns. Final report. National Science Foundation Grant SPI-78-03490. Department of Fisheries and Wildlife, Oregon State University, Corvallis. 175 pp.
Related Concept Name: Elymus triticoides - Juncus balticus
Relationship: F - Finer
Reference: Easterday, J. C., and M. S. Mamone. 1980. Vegetation of Warner Valley. Pages 3-66 in: C. Gilman, project director. Analysis of the aquatic habitats of Warner Valley with relation to land use patterns. Final report. National Science Foundation Grant SPI-78-03490. Department of Fisheries and Wildlife, Oregon State University, Corvallis. 175 pp.
Related Concept Name: Leymus triticoides-Poa secunda
Relationship: = - Equivalent
Reference: 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.

Ecological Systems Placement

Ecological Systems Placement
Ecological System Unique ID Ecological System Name
CES304.786 Inter-Mountain Basins Playa
CES304.998 Inter-Mountain Basins Alkaline Closed Depression


NatureServe Conservation Status
Global Status: G2 (02Jan2001)
Rounded Global Status: G2 - Imperiled
Reasons: This grassland is a fairly rare community with only 6 known occurrences, although more are likely. Total estimated area is between 6000 and 15,000 acres. Most stands tend to be small. Improper cattle grazing, water diversions, and agriculture (primarily hay production) have impacted large areas of habitat. Few high-quality remnants remain. Most occurrences are very threatened. While they are found in a public landscape, most occurrences are privately owned and more difficult to protect. This grassland habitat occurs in valley bottoms with soils that support agriculture and have some moderately fresh water available.

Distribution
Color legend for Distribution Map
United States Distribution: CA, NV, OR
Global Distribution: United States
Global Range: These communities are currently only known from the Northern Great Basin. Published records are from south-central Oregon near the California-Nevada border, and in Inyo County, California. However, it is likely found in Nevada. Leymus triticoides is very widespread, but these moderately freshwater habitats appear to be much more restricted.

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: Confident or certain
Domain Name: Humid Temperate Domain
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: Modoc Plateau Section
Section Code: M261G Occurrence Status: Confident or certain


Vegetation

Vegetation Summary: Leymus triticoides is the characteristic plant, with Poa secunda (= Poa juncifolia and sometimes still considered as Poa secunda ssp. juncifolia) usually codominant. In the more alkaline areas, Distichlis spicata or Puccinellia spp. can be found, although the most alkaline expressions should be considered a different association. These moist, playa grasslands are distinctive in the very high, predominately rhizomatous grass cover, with frequencies of Leymus triticoides averaging over 85%.

Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Charact-
eristic
Dominant Constant
Cover Class %
Con-
stancy
%
Leymus triticoides G2 Graminoid Herb (field)  
 
 
Poa secunda G2 Graminoid Herb (field)  
 
 


Environmental Setting

Wetland Indicator: Y
Environmental Summary: It is found in flat, alkaline wetlands, associated with playa lakes, or rarely seasonal streams. In Oregon, elevations range from 1220-1525 m (4000-5000 feet) in elevation.


Dynamic Processes


Plot Sampling & Classification Analysis

Plots stored in VegBank


Authors/Contributors
Concept Author(s): J.S. Kagan
Element Description Edition Date: 26Nov1997
Element Description Author(s): J.S. Kagan
NatureServe Conservation Status Factors Edition Date: 26Oct2000
NatureServe Conservation Status Factors Author(s): J.S. Kagan

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.

  • Christy, J. A. 2013. Wet meadow plant associations, Malheur National Wildlife Refuge, Harney County, Oregon. Oregon Biodiversity Information Center, Institute for Natural Resources, Portland State University, Portland.

  • Driscoll, R. S., D. L. Merkel, D. L. Radloff, D. E. Snyder, and J. S. Hagihara. 1984. An ecological land classification framework for the United States. Miscellaneous Publication No. 1439. USDA Forest Service, Washington, DC. 56 pp.

  • Easterday, J. C., and M. S. Mamone. 1980. Vegetation of Warner Valley. Pages 3-66 in: C. Gilman, project director. Analysis of the aquatic habitats of Warner Valley with relation to land use patterns. Final report. National Science Foundation Grant SPI-78-03490. Department of Fisheries and Wildlife, Oregon State University, Corvallis. 175 pp.

  • Kagan, J. S., J. A. Christy, M. P. Murray, and J. A. Titus. 2000-2004. Classification of native vegetation of Oregon. Oregon Natural Heritage Program, Portland. 63 pp.

  • Odion, D. C., R. M. Callaway, W. R. Ferren, and F. W. Davis. 1992. Vegetation of Fish Slough, an Owens Valley wetland ecosystem. Pages 171-196 in: C.A. Hall and B. Widawski, editors. The history of water: Eastern Sierra Nevada, Owens Valley, White-Inyo Mountains. White Mountains Research Station Symposium 4. University of California, White Mountain Research Station, Los Angeles, CA.

  • Peterson, E. B. 2008. International Vegetation Classification alliances and associations occurring in Nevada with proposed additions. Nevada Natural Heritage Program, Carson City, NV. 348 pp.

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


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