Name:
(Cephalanthus occidentalis) / Dulichium arundinaceum - (Polygonum hydropiperoides, Glyceria acutiflora, Proserpinaca palustris) Marsh
Reference:
NatureServe Biotics 2019
Description:
This community occurs in mostly seasonally flooded (rarely semipermanently flooded) depression ponds in the Central Appalachian, Ridge and Valley, and Northern Blue Ridge provinces. Habitats are thought to have formed by solution or collapse of underlying bedrock strata. Occurrences range from 470 m (1540 feet) to over 900 m (3000 feet) elevation. Topographic position varies from ridge crests to mountain-foot alluvial. Ridge and Valley ponds developed on sideslope benches resulting from landsliding and catastrophic slope failure are often referred to as "sag ponds." Ponds developed by solution and collapse of carbonate rocks underlying acidic alluvial and colluvial materials eroded from the Blue Ridge and deposited along the eastern edge of the Great Valley of Virginia in massive alluvial fans are often referred to as "Shenandoah Valley sinkhole ponds." These topographically variable wetlands range from seasonally to semipermanently flooded, with water levels maintained by continually perched groundwater or seepage inputs. Overall hydrologic regime is best characterized as seasonally flooded, but two or three of the ponds are almost always flooded year-round. Substrates are generally organic, and the surficial peat in which emergent plants are rooted is extremely acidic. Vegetation varies from entirely herbaceous to a fairly dense shrubland dominated by <i>Cephalanthus occidentalis</i>. Many of the ponds are primarily herbaceous but have outer zones, discrete patches, or islands of shrubs within them. Where present, <i>Cephalanthus</i> occurs in variable abundance, often being limited to marginal zones or specific areas of the pond. In the typical, seasonally flooded ponds, the herb layer is typically dense and dominated by <i>Dulichium arundinaceum</i>. The most frequent and characteristic herbaceous associates are <i>Glyceria acutiflora, Polygonum hydropiperoides</i>, and <i>Proserpinaca palustris</i>. Some ponds have a deep center that is dominated by a zone of <i>Nuphar advena</i>. Several other forbs and graminoids, including <i>Bidens discoidea, Carex canescens ssp. disjuncta, Carex lasiocarpa var. americana, Carex lupulina, Carex stricta, Carex vesicaria, Glyceria septentrionalis, Glyceria canadensis, Glyceria obtusa, Scirpus ancistrochaetus, Schoenoplectus torreyi, Triadenum virginicum, Triadenum fraseri</i>, and <i>Utricularia</i> spp. are inconstant but locally patch-dominant. Semipermanently flooded ponds tend to be floristically depauperate and contain a high proportion of floating or submersed aquatic species, including <i>Torreyochloa pallida, Eleocharis palustris, Glyceria acutiflora, Potamogeton</i> spp., <i>Proserpinaca palustris</i>, and <i>Utricularia</i> spp.
Accession Code:
urn:lsid:vegbank.org:commConcept:32608-{9821E62B-3C94-4BDF-8883-BE144194EE2C}
Plot-observations of this Community Concept:
28
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Names:
UID: ELEMENT_GLOBAL.2.836282
NatureServe
Explorer
Code: CEGL003746
Translated: (Common Buttonbush) / Threeway Sedge - (Swamp Smartweed, Creeping Mannagrass, Marsh Mermaidweed) Marsh
Common: Central Appalachian Montane Depression Pond (Threeway Sedge - Buttonbush Type)
Scientific: (Cephalanthus occidentalis) / Dulichium arundinaceum - (Polygonum hydropiperoides, Glyceria acutiflora, Proserpinaca palustris) Marsh
(convergence) and Synonyms:
(similar)
(Cephalanthus occidentalis) / Dulichium arundinaceum - (Polygonum hydropiperoides, Glyceria acutiflora, Proserpinaca palustris) Herbaceous Vegetation
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