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CEGL003327 Eragrostis hypnoides - Gnaphalium palustre Mudflat

The U.S. National
Vegetation Classification
Type Concept Sentence:
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Common (Translated Scientific) Name: Teal Lovegrass - Western Marsh Cudweed Mudflat
Colloquial Name:
Hierarchy Level: Association
Type Concept: This herbaceous vegetation occurs from California to British Columbia and eastward at 12 to 152 m (40-500 feet) elevation. Habitat is low-elevation beds of dried shallow seasonal pools and lakes. Soils are seasonally flooded to saturated silt loam. Trees are peripheral and not included in plots, but the setting is usually adjacent to bottomland forest of Fraxinus latifolia and Populus balsamifera ssp. trichocarpa. Salix lucida ssp. lasiandra is present in half the sampled plots, and Salix fluviatilis is also often present, but neither occurs in large amounts. The herb layer contains about 20 annual and perennial species adapted to early-season inundation and subsequent exposure as lakes and ponds dry up. Most exotic species are excluded by inundation extending into the growing season. Eragrostis hypnoides is the primary species with an average cover of 37% and cover ranging up to 85%, while Gnaphalium palustre has somewhat lower constancy but similar cover when present. Lindernia dubia forms patches in some stands. The remaining species occur only in trace amounts. Eragrostis hypnoides forms a loose and patchy sod with Gnaphalium, and considerable bare ground may be present. These sites appear to be drier than those occupied by the mudflat vegetation of Lilaeopsis occidentalis or Azolla associations, the mud often cracking deeply and the top layer losing most of its moisture.
Diagnostic Characteristics: No Data Available
Rationale for Nominal Species or Physiognomic Features:
Classification Comments: No Data Available
Similar NVC Types:
Physiognomy and Structure: No Data Available
Floristics:
Dynamics: No Data Available
Environmental Description: No Data Available
Geographic Range: This herbaceous vegetation occurs from California to British Columbia and eastward. In northwestern Oregon, it is found in the Willamette Valley and Columbia River bottoms in Vancouver Basin (Christy 2004).
Nations: CA, US
States/Provinces: BC, CA, OR, WA
US Forest Service Ecoregions (1994/1995)
Domain Name:
Division Name:
Province Name: Pacific Lowland Mixed Forest Province
Province Code: 242    Occurrence Status: Confident or certain
Section Name: Willamette Valley and Puget Trough Section
Section Code: 242A     Occurrence Status: Confident or certain
US Forest Service Ecoregions (2007)
Domain Name:
Division Name:
Province Name: Pacific Lowland Mixed Forest Province
Province Code: 242    Occurrence Status: Confident or certain
Section Name: Puget Trough Section
Section Code: 242A     Occurrence Status: Confident or certain
Omernik Ecoregions:
Confidence Level: Low - Poorly Documented
Confidence Level Comments:
Grank: G2
Greasons:
Concept Lineage:
Predecessors:
Obsolete Names:
Obsolete Parents:
Synonomy: = Eragrostis hypnoides - Gnaphalium palustre (McCain and Christy 2005) [4 plots]
= Eragrostis hypnoides - Gnaphalium palustre Association (Christy 2004)
> Gnaphalium palustre sloughs (Titus et al. 1996)
Concept Author(s): J.A. Christy (2004)
Author of Description: J.A. Christy (2004)
Acknowledgements:
Version Date: 13Jun2006
References:
  • Christy, J. A. 2004. Native freshwater wetland plant associations of northwestern Oregon. Oregon Natural Heritage Information Center, Oregon State University, Portland, OR.
  • 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.
  • McCain, C., and J. A. Christy. 2005. Field guide to riparian plant communities in northwestern Oregon. Technical Paper R6-NR-ECOL-TP-01-05. USDA Forest Service, Pacific Northwest Region, Portland. 357 pp.
  • Titus, J. H., J. A. Christy, D. Vander Schaaf, J. S. Kagan, and E. R. Alverson. 1996. Native wetland, riparian, and upland plant communities and their biota in the Willamette Valley, Oregon. Report to the Environmental Protection Agency, Region X, Seattle, WA. Willamette Basin Geographic Initiative. Oregon Natural Heritage Program, The Nature Conservancy, Portland, OR.
  • Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.
  • WNHP [Washington Natural Heritage Program]. 2018. Unpublished data files. Washington Natural Heritage Program, Department of Natural Resources, Olympia, WA.