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Panicum rigidulum - Hibiscus moscheutos Wet Meadow
Translated Name: Redtop Panicgrass - Crimson-eyed Rosemallow Wet Meadow
Common Name: Atlantic Coastal Plain Blackwater Sand Bar
Unique Identifier: CEGL004273
Classification Approach: International Vegetation Classification (IVC)
Summary: This association occurs on recent deposits of sand along blackwater rivers, generally on point bars, but sometimes along straight stretches of channel. Vegetation is patchy, sparse over most of the area of the community, but ranging to dense in different parts of even small patches. Panicum rigidulum, Phanopyrum gymnocarpon, Panicum hemitomon, or Polygonum punctatum (= Persicaria punctata) are usually the most common species. Other herbs include Polygonum spp. (= Persicaria spp.), Boehmeria cylindrica, Hydrocotyle verticillata, Sacciolepis striata, Cyperus polystachyos, and Micranthemum umbrosum. Ruderal species such as Digitaria spp., Eupatorium compositifolium, and Cyperus spp. often occur in small numbers. Hibiscus moscheutos is prominent in some examples. Shrubs typical of riverbanks and other adjacent forest communities are often present in small numbers, including Cyrilla racemiflora, Cornus foemina (= Cornus stricta), and Vaccinium elliottii. Young trees or small numbers of older trees are often present, including Betula nigra, Taxodium distichum, Quercus laurifolia, Quercus lyrata, and Carpinus caroliniana.



Classification

Classification Confidence: Low - Poorly Documented
Classification Comments: This community is probably common on most of the larger blackwater rivers of the southeastern Atlantic Coastal Plain, but it is seldom described or sampled. Eragrostis hypnoides - Micranthemum umbrosum - Lipocarpha micrantha - (Juncus repens) Wet Meadow (CEGL004341) is a rare lower, wetter, finer-textured bar community that sometimes co-occurs. Betula nigra - Quercus laurifolia - Taxodium (distichum, ascendens) / Crataegus aestivalis Riparian Forest (CEGL004282) often occurs on slightly older deposits farther up point bars. An equivalent association likely occurs on bars of brownwater rivers.

Vegetation Hierarchy
Class 2 - Shrub & Herb Vegetation
Subclass 2.C - Shrub & Herb Wetland
Formation 2.C.4 - Temperate to Polar Freshwater Marsh, Wet Meadow & Shrubland
Division 2.C.4.Ne - Atlantic & Gulf Coastal Marsh, Wet Meadow & Shrubland
Macrogroup Atlantic & Gulf Coastal Plain Wet Prairie & Marsh
Group Atlantic & Gulf Coastal Plain River & Basin Freshwater Marsh
Alliance Southeastern Herbaceous Sandbar

This is the revised vegetation hierarchy. For more information see Classification Sources and usnvc.org.



Related Concepts from Other Classifications

Related Subnational Community Units
These data are subject to substantial ongoing revision and may be out of date for some states.
In the U.S., contact the state Heritage Program for the most complete and up-to-date information at: http://www.natureserve.org/natureserve-network.
Information from programs in other jurisdictions will be posted when they are made available.
Subnation Concept Name Relationship to Standard Confidence Reference
North Carolina Sand and Mud Bar (Blackwater Sand Bar Subtype) Equivalent Certain Schafale 2012


Other Related Concepts
Related Concept Name: Sand and Mud Bar (Blackwater Sand Bar Subtype)
Relationship: = - Equivalent
Reference: Schafale, M. P. 2012. Classification of the natural communities of North Carolina, 4th Approximation. North Carolina Department of Environment, Health, and Natural Resources, Division of Parks and Recreation, Natural Heritage Program, Raleigh.

Ecological Systems Placement

Ecological Systems Placement
Ecological System Unique ID Ecological System Name
CES203.249 Atlantic Coastal Plain Small Blackwater River Floodplain Forest


NatureServe Conservation Status
Global Status: G2G3 (12Jan2009)
Rounded Global Status: G2 - Imperiled

Distribution
Color legend for Distribution Map
United States Distribution: GApotentially occurs, NC, SC
Global Distribution: United States
Global Range: This association occurs in southern North Carolina, South Carolina, and potentially farther south.

U.S. Forest Service Ecoregions
Domain Name: Humid Temperate Domain
Division Name: Subtropical Division
Province Name: Outer Coastal Plain Mixed Forest Province
Province Code: 232 Occurrence Status: Confident or certain


Vegetation

Vegetation Summary: Vegetation is patchy, sparse over most of the area of the community, but ranging to dense in different parts of even small patches. Panicum rigidulum is the most constant and usually often most abundant species. Other herbs include Polygonum punctatum (= Persicaria punctata) and other Polygonum spp. (= Persicaria spp.), Boehmeria cylindrica, Hydrocotyle verticillata, Sacciolepis striata, and Micranthemum umbrosum. On the Waccamaw River, rare species such as Hymenocallis palmeri (= Hymenocallis pygmaea) and Sabatia kennedyana may be abundant. Ruderal species such as Digitaria spp., Eupatorium compositifolium, and Cyperus spp. often occur in small numbers. Hibiscus moscheutos is prominent in some examples. Shrubs typical of riverbanks and other adjacent forest communities are often present in small numbers, including Cyrilla racemiflora, Cornus foemina (= Cornus stricta), and Vaccinium elliottii. Young trees or small numbers of older trees are often present, including Betula nigra, Taxodium distichum, Quercus laurifolia, Quercus lyrata, and Carpinus caroliniana.

Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Charact-
eristic
Dominant Constant
Cover Class %
Con-
stancy
%
Hibiscus moscheutos G2 Flowering forb Herb (field)  
 
 
Hymenocallis palmeri G2 Flowering forb Herb (field)      
 
 
Sabatia kennedyana G2 Flowering forb Herb (field)      
 
 
Panicum rigidulum G2 Graminoid Herb (field)  
 
 


At-Risk Species Reported for this Association
Scientific Name
  (Common Name)
NatureServe Global Status U.S. Endangered Species Act Status
Hymenocallis palmeri
  (Alligator-lily)
G3?  
Sabatia kennedyana
  (Plymouth Rose-gentian)
G3  


Environmental Setting

Wetland Indicator: Y
Environmental Summary: This association occurs on recent deposits of sand along blackwater rivers, generally on point bars, but sometimes along straight stretches of channel. These substrates are young and show little soil development. They may be reworked by floodwaters, and parts may be subject to ongoing deposition that can bury vegetation; other parts are more stable.


Dynamic Processes

Dynamics: This community is prone to substantial disturbance by floods, including scouring, reworking of soil, and burial by newly deposited sand or wrack. This chronic disturbance, combined with limited soil fertility, likely produces slow development of vegetation. This community can be expected, over periods of many years, to develop into Betula nigra - Quercus laurifolia - Taxodium (distichum, ascendens) / Crataegus aestivalis Riparian Forest (CEGL004282).


Plot Sampling & Classification Analysis

Plots stored in VegBank


Authors/Contributors
Concept Author(s): M.P. Schafale
Element Description Edition Date: 12Jan2009
Element Description Author(s): M.P. Schafale

Ecological data developed by NatureServe and its network of natural heritage programs (see Local Programs) and other contributors and cooperators (see Sources).


References
  • Schafale, M. P. 2012. Classification of the natural communities of North Carolina, 4th Approximation. North Carolina Department of Environment, Health, and Natural Resources, Division of Parks and Recreation, Natural Heritage Program, Raleigh.

  • Southeastern Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Durham, NC.


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Version 7.1 (2 February 2009)
Data last updated: November 2016