Common (Translated Scientific) Name: Blunt Spikerush - Teal Lovegrass - Marsh Seedbox Temperate Pacific Freshwater Wet Mudflat Group
Colloquial Name: Temperate Pacific Freshwater Wet Mudflat
Hierarchy Level: Group
Type Concept: This group consists of communities that occur on freshwater mudflats found scattered throughout the temperate regions of the western U.S. and Canada. They are dominated mainly by low-statured annual plants and range in physiognomy from sparsely vegetated mud to extensive sods of herbaceous vegetation. The predominant species include Crassula aquatica, Eleocharis obtusa, Eragrostis hypnoides, Gnaphalium palustre, Lilaeopsis occidentalis, Limosella aquatica, and/or Ludwigia palustris. In the Pacific Northwest, they occur primarily in seasonally or tidally flooded shallow lakebeds and on floodplains, especially along the lower Columbia River. During any one year, they may be absent because of year-to-year variation in river water levels. Mudflats must be exposed before the vegetation develops from the seedbank.
Diagnostic Characteristics: Extensive tidally or seasonally drained shallow lakebeds or floodplains exposing mudflats that may develop low-statured herbaceous annual vegetation.
Rationale for Nominal Species or Physiognomic Features:
Classification Comments: No Data Available
Similar NVC Types:
G385 North American Pacific Intertidal Algal Flat, note:
Physiognomy and Structure: Low-statured annual plants from sparsely vegetated mud to extensive sods of herbaceous vegetation.
Floristics: The predominant species include Crassula aquatica, Cyperus squarrosus, Eleocharis obtusa, Eragrostis hypnoides, Gnaphalium palustre, Lilaeopsis occidentalis, Limosella aquatica, Ludwigia palustris, and Rorippa curvisiliqua.
Dynamics: Stands may be absent because of year-to-year variation in river water levels. Mudflat vegetation develops from the seedbank only after water has receded and the mudflat is exposed to air.
Environmental Description: Climate: Temperate. Soil/substrate/hydrology: Seasonally flooded shallow lakebeds and on floodplains.
Geographic Range: This group is found throughout the temperate regions of the western U.S. and Canada, from Alaska south into California, east into Idaho, Montana, Wyoming, Utah, Nevada and Colorado. It is best known and described from along the Columbia River, but occurs in similar habitats throughout the temperate west.
Nations: CA, US
States/Provinces: AK, BC, CA, CO, ID, MT, NV, OR, UT, WA, WY
|US Forest Service Ecoregions (2007)|
Pacific Lowland Mixed Forest Province
Confident or certain
Willamette Valley Section
Confident or certain
Confidence Level: High
Confidence Level Comments:
Concept Author(s): C. Chappell, in Faber-Langendoen et al. (2011)
Author of Description: C. Chappell and G. Kittel
Version Date: 02Dec2015
- Chappell, C., and J. Christy. 2004. Willamette Valley-Puget Trough-Georgia Basin Ecoregion Terrestrial Ecological System EO Specs and EO Rank Specs. Appendix 11 in: J. Floberg, M. Goering, G. Wilhere, C. MacDonald, C. Chappell, C. Rumsey, Z. Ferdana, A. Holt, P. Skidmore, T. Horsman, E. Alverson, C. Tanner, M. Bryer, P. Lachetti, A. Harcombe, B. McDonald, T. Cook, M. Summers, and D. Rolph. Willamette Valley-Puget Trough-Georgia Basin Ecoregional Assessment, Volume One: Report prepared by The Nature Conservancy with support from The Nature Conservancy of Canada, Washington Department of Fish and Wildlife, Washington Department of Natural Resources (Natural Heritage and Nearshore Habitat programs), Oregon State Natural Heritage Information Center and the British Columbia Conservation Data Centre.
- Christy, J. A. 2004. Native freshwater wetland plant associations of northwestern Oregon. Oregon Natural Heritage Information Center, Oregon State University, Portland, OR.
- Faber-Langendoen, D., J. Drake, S. Gawler, M. Hall, C. Josse, G. Kittel, S. Menard, C. Nordman, M. Pyne, M. Reid, L. Sneddon, K. Schulz, J. Teague, M. Russo, K. Snow, and P. Comer, editors. 2010-2019a. Divisions, Macrogroups and Groups for the Revised U.S. National Vegetation Classification. NatureServe, Arlington, VA. plus appendices. [in preparation]
- Holland, V. L., and D. J. Keil. 1995. California vegetation. Kendall/Hunt Publishing Company, Dubuque, IA. 516 pp.
- Rodriguez, D., K. G. Sikes, T. Keeler-Wolf, G. Kittel, J. Curtis, C. Curley, and J. Evens. 2017. Vegetation classification of Channel Islands National Park. Report to the National Park Service, Fort Collins, CO.