Invalid Unit Specified
A3851 Eleocharis obtusa - Eragrostis hypnoides Intertidal Mudflat Alliance

The U.S. National
Vegetation Classification
Type Concept Sentence: This is an herbaceous alliance dominated by graminoid species such as Eleocharis obtusa and Eragrostis hypnoides. The alliance is strictly herbaceous and dominated by low and prostrate graminoids, i.e., species that tolerate early-season flooding and summer drying that exposes mudflats with subirrigation. These occur on mudflats around wetlands that are seasonally flooded and subirrigated in the western U.S. These low-elevation (<1000 m [3280 feet]) marshes and mudflats occur along low-gradient streams, shallow ponds, and depressional wetlands. Soil is seasonally flooded to perennially saturated silt loam to clay.
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Common (Translated Scientific) Name: Blunt Spikerush - Teal Lovegrass Intertidal Mudflat Alliance
Colloquial Name: Western Graminoid Intertidal Mudflat
Hierarchy Level: Alliance
Type Concept: This is an herbaceous alliance dominated by graminoid species such as Eleocharis obtusa and Eragrostis hypnoides. The alliance is strictly herbaceous and dominated by low and prostrate graminoids, i.e., species that tolerate early-season flooding and summer drying that exposes mudflats with subirrigation. These occur on mudflats around wetlands that are seasonally flooded and subirrigated in the western U.S. These low-elevation (<1000 m [3280 feet]) marshes and mudflats occur along low-gradient streams, shallow ponds, and depressional wetlands. Soil is seasonally flooded to perennially saturated silt loam to clay.
Diagnostic Characteristics: Sparse to dense cover of low and prostrate herbaceous graminoid species on exposed mudflats.
Rationale for Nominal Species or Physiognomic Features:
Classification Comments: Forb-dominated mudflats are covered by a different alliance.
Similar NVC Types:
Physiognomy and Structure: Sparse to dense cover of low and prostrate herbaceous graminoid species on exposed mudflats.
Floristics: This is an herbaceous alliance dominated by graminoid species such as Eleocharis obtusa and Eragrostis hypnoides. The alliance is strictly herbaceous and dominated by low and prostrate graminoids, i.e., species that tolerate early-season flooding and summer drying that exposes mudflats with subirrigation.
Dynamics: No Data Available
Environmental Description: Stands occur on mudflats around wetlands that are seasonally flooded and subirrigated in the western U.S. These low-elevation (<1000 m [3280 feet]) marshes and mudflats occur along low-gradient streams, shallow ponds, and depressional wetlands. Soil is seasonally flooded to perennially saturated silt loam to clay.
Geographic Range: This alliance is currently reported for Oregon and Washington but is likely to occur throughout the western U.S. and possibly adjacent Canada in low-lying places.
Nations: CA, US
States/Provinces: OR, WA
US Forest Service Ecoregions (1994/1995)
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Confidence Level: Low
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Grank: GNR
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Concept Author(s): G. Kittel, in Faber-Langendoen et al. (2013)
Author of Description: G. Kittel
Acknowledgements:
Version Date: 18Dec2014
References:
  • Faber-Langendoen, D., J. Drake, M. Hall, G. Kittel, S. Menard, C. Nordman, M. Pyne, M. Reid, M. Russo, K. Schulz, L. Sneddon, K. Snow, and J. Teague. 2013-2019b. Screening alliances for induction into the U.S. National Vegetation Classification: Part 1 - Alliance concept review. NatureServe, Arlington, VA.