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Rhynchospora spp. - Panicum rigidulum - Panicum verrucosum Pondshore Marsh Alliance | NatureServe Biotics 2019
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Name: Rhynchospora spp. - Panicum rigidulum - Panicum verrucosum Pondshore Marsh Alliance
Reference: NatureServe Biotics 2019
Description: This alliance accommodates a variety of seasonally flooded vegetation of pondshore and lakeshore environments. Occurrences of this alliance are usually small and dominated by herbaceous graminoid species such as <i>Panicum rigidulum, Panicum verrucosum, Rhexia virginica, Rhynchospora</i> spp., and <i>Saccharum giganteum</i>. Many other graminoid species are common in these depressions. Some associations may include a zone dominated by taller graminoids, including <i>Saccharum</i> spp. or <i>Scirpus cyperinus</i>. Many species are annual or short-lived perennial plants. They persist for years in the seedbank until the hydrologic conditions are right for germination. Thus, species composition of particular stands may change from year to year. In interior stations of this alliance, many of these seedbank plants are species significantly disjunct from their main range on the Atlantic Coastal Plain. There are two major vegetation zones that occur in this environment: Zone 1 is a seasonally flooded zone of sparse cover by graminoids; and Zone 2 is a saturated zone of dense graminoid cover. These ponds have a pronounced seasonal fluctuation in water level, filling in the winter and drying in the summer. The water table fluctuates seasonally and yearly. It is highest in late winter and spring, and during years of high precipitation. The soils are derived mainly from sand, which is poor in nutrients and is acidic, with pH ranging from 4.4-7.0. These conditions inhibit microbial decomposition and considerable organic material accumulates as peat. This alliance occurs primarily along the Atlantic Coastal Plain from Nova Scotia, Canada, south to Virginia, with inland stations in the central Great Lakes area, the Great Valley of Virginia, northern Alabama, and central Tennessee. 
Accession Code: urn:lsid:vegbank.org:commConcept:38221-{93AEFE74-D69A-4974-89C4-940BC77707A9}
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 15-Aug-2017 to: ongoing
      Names:   UID: ELEMENT_GLOBAL.2.899125 NatureServe ExplorerNatureServe Explorer logo
  Code: A1384
  Translated: Beaksedge species - Redtop Panicgrass - Warty Panicgrass Pondshore Marsh Alliance
  Common: Coastal Plain Beaksedge - Panicgrass Pondshore Marsh
  Scientific: Rhynchospora spp. - Panicum rigidulum - Panicum verrucosum Pondshore Marsh Alliance
(convergence) and Synonyms:
(similar) A.1384
(similar) Rhynchospora spp. - Panicum (rigidulum, verrucosum) - Rhexia virginica Seasonally Flooded Herbaceous Alliance