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CEGL004971 Spartina patens - Panicum amarum - Hydrocotyle bonariensis Grassland

Type Concept Sentence: No Data Available


Common (Translated Scientific) Name: Saltmeadow Cordgrass - Bitter Panicgrass - Beach Marsh-pennywort Grassland

Colloquial Name: West Gulf Coastal Plain Cordgrass Dune Grassland

Hierarchy Level:  Association

Type Concept: This association occurs on low dunes of barrier islands along the Louisiana and Texas coasts. In Louisiana, it is known from the Chandeleurs and related islands, where Spartina patens replaces Uniola paniculata (which is present in small amounts) as the dominant grass along the upper beach and primary dune. Louisiana barrier islands are the only areas in the southeastern U.S. to show a dominance by Spartina patens on the upper beach and primary dune. On the barrier islands of coastal Texas, this vegetation is found on stabilized secondary dunes where Spartina patens and Paspalum monostachyum typically codominate. Other grasses that may be present include Panicum amarum, Sporobolus virginicus, Cenchrus spinifex, Eustachys petraea, and Eragrostis secundiflora ssp. oxylepis. Other characteristic species include Galactia canescens, Rhynchosia americana, Opuntia stricta, Chamaecrista fasciculata, Lythrum californicum, Helianthus argophyllus, Croton punctatus, Fimbristylis castanea, Sabatia stellaris, Cakile spp., Chamaesyce bombensis, and Ipomoea imperati. The sediments which form beach parent material change abruptly between Ship Island (Mississippi) on the east and the Chandeleur Islands (Louisiana) to the west.

Diagnostic Characteristics: No Data Available

Rationale for Nominal Species or Physiognomic Features: No Data Available

Classification Comments: No Data Available

Similar NVC Types: No Data Available
note: No Data Available

Physiognomy and Structure: No Data Available

Floristics: Louisiana barrier islands are the only areas in the southeastern U.S. to show a dominance by Spartina patens on the upper beach and primary dune (Barbour et al. 1987). On the barrier islands of coastal Texas, this vegetation is found on stabilized secondary dunes where Spartina patens and Paspalum monostachyum typically codominate. Other grasses that may be present include Panicum amarum, Sporobolus virginicus, Cenchrus spinifex (= Cenchrus incertus), Eustachys petraea, and Eragrostis secundiflora ssp. oxylepis (= Eragrostis oxylepis). Other characteristic species include Galactia canescens, Rhynchosia americana, Opuntia stricta, Chamaecrista fasciculata (= Cassia fasciculata), Lythrum californicum, Helianthus argophyllus, Croton punctatus, Fimbristylis castanea, Sabatia stellaris, Cakile spp., Chamaesyce bombensis (= Chamaesyce ingallsii), and Ipomoea imperati (= Ipomoea stolonifera).

Dynamics:  This community receives the force of wind and salt spray but is beyond the influence of most storm tides. It is periodically strongly altered by hurricanes and other storm events.

Environmental Description:  This association occurs on low dunes of barrier islands along the Louisiana and Texas coasts. In Louisiana, it occurs on the upper beach and primary dune; in Texas, it occurs on stabilized secondary dunes. The substrate is almost exclusively sandy, unstable, and droughty (Typic Quartzipsamments) with no soil profile development.

Geographic Range: This association ranges from Louisiana to Texas.

Nations: US

States/Provinces:  LA, TX




Confidence Level: Low - Poorly Documented

Confidence Level Comments: No Data Available

Grank: G2?

Greasons: No Data Available


Concept Lineage: No Data Available

Predecessors: No Data Available

Obsolete Names: No Data Available

Obsolete Parents: No Data Available

Synonomy: < Louisiana-Texas Beach Vegetation (Barbour et al. 1987)

Concept Author(s): Barbour et al. (1987)

Author of Description: L.M. Smith and M. Pyne

Acknowledgements: No Data Available

Version Date: 12-12-97

  • Barbour, M. G., M. Rejmanek, A. F. Johnson, and B. M. Pavlik. 1987. Beach vegetation and plant distribution patterns along the northern Gulf of Mexico. Phytocoenologia 15:201-234.
  • Gould, E., and J. Ewan. 1975. Phytogeographic and ecologic relationships of the flora of Breton Island (St. Bernard Parish, Louisiana) Tulane Studies in Zoology and Botany 19:26-36.
  • LNHP [Louisiana Natural Heritage Program]. 2009. Natural communities of Louisiana. Louisiana Natural Heritage Program, Louisiana Department of Wildlife & Fisheries, Baton Rouge. 46 pp. [http://www.wlf.louisiana.gov/sites/default/files/pdf/page_wildlife/6776-Rare%20Natural%20Communities/LA_NAT_COM.pdf]
  • Lemaire, R. J. 1961. A preliminary annotated checklist of the vascular plants of the marshes and included higher lands of St. Bernard Parish, Louisiana. Proceedings of the Louisiana Academy of Sciences 24:56-70.
  • Montz, G. N. 1981. Annotated checklist of plants of the coastal beaches, islands and barrier islands of Louisiana. U.S. Army Corps of Engineers, New Orleans District.
  • Southeastern Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Durham, NC.