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Eragrostis hypnoides - Micranthemum umbrosum - Lipocarpha micrantha - (Juncus repens) Wet Meadow
Translated Name: Teal Lovegrass - Shade Mudflower - Small-flower Halfchaff Sedge - (Lesser Creeping Rush) Wet Meadow
Common Name: Coastal Plain Blackwater Drawdown Riverbank
Unique Identifier: CEGL004341
Classification Approach: International Vegetation Classification (IVC)
Summary: This annual-dominated community occupies drawdown banks of blackwater rivers and other seasonally flooded muddy to silty banks. Annuals dominate this community and can include Eragrostis hypnoides, Lipocarpha micrantha (= Hemicarpha micrantha), Fimbristylis autumnalis, Micranthemum umbrosum, Lindernia dubia var. dubia, Lindernia dubia var. anagallidea, Fimbristylis perpusilla. Perennials are also present, including Juncus repens, Helenium flexuosum, Gratiola aurea, Sabatia kennedyana, but the community is generally dominated by a sparse to dense turf of annuals, most of the cover 2-10 cm tall. Seedlings and scattered larger individuals of trees such as Betula nigra and Acer rubrum may occur. Other species present may include Bidens frondosa, Boehmeria cylindrica, Commelina diffusa, Cyperus erythrorhizos, Cyperus polystachyos, Diodia virginiana, Digitaria sanguinalis, Echinochloa muricata, Echinodorus cordifolius, Eleocharis obtusa, Erechtites hieraciifolia, Hydrocotyle verticillata var. verticillata, Hypericum mutilum, Hypoxis curtissii (= Hypoxis leptocarpa), Justicia ovata, Ludwigia decurrens, Ludwigia palustris, Mitreola petiolata, Oldenlandia boscii, Panicum dichotomiflorum, Panicum rigidulum var. elongatum, Panicum verrucosum, Paspalum fluitans, Pluchea camphorata, Polygonum hydropiperoides, Polygonum pensylvanicum, Rhynchospora corniculata, Rotala ramosior, Sabatia calycina, Scirpus cyperinus, and Triadenum walteri. A wide range of other species may occur, including aliens, since seeds wash into this community from a variety of sources. This community often provides habitat for globally or regionally rare plant species, many of them adapted for this unusual environment.



Classification

Classification Confidence: Low - Poorly Documented
Classification Comments: Excellent examples occur along the Waccamaw River, North Carolina and South Carolina, and along the Blackwater River, Virginia (Ludwig 1996).

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.

Similar Associations
Unique Identifier Name
CEGL006483 Eragrostis hypnoides - Ludwigia palustris - Lindernia dubia - Cyperus squarrosus Riverbar Wet Meadow



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 Drawdown Bar Subtype) Equivalent Certain Schafale 2012


Other Related Concepts
Related Concept Name: Sand / Gravel / Mud Bar/Shore
Relationship: B - Broader
Reference: Fleming, G. P., P. P. Coulling, D. P. Walton, K. M. McCoy, and M. R. Parrish. 2001. The natural communities of Virginia: Classification of ecological community groups. First approximation. Natural Heritage Technical Report 01-1. Virginia Department of Conservation and Recreation, Division of Natural Heritage, Richmond, VA. 76 pp.
Related Concept Name: Sand and Mud Bar
Relationship: B - Broader
Reference: Schafale, M. P., and A. S. Weakley. 1990. Classification of the natural communities of North Carolina. Third approximation. North Carolina Department of Environment, Health, and Natural Resources, Division of Parks and Recreation, Natural Heritage Program, Raleigh. 325 pp.

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: G2 (23Jan2000)
Rounded Global Status: G2 - Imperiled
Reasons: This community occurs along drawdown banks of blackwater rivers with sufficient flow (and change in flow) to support this annual-dominated community. Thus, the potential sites are naturally limited to major to moderate-sized blackwater rivers of the coastal plain of from southeastern Virginia south into South Carolina and possibly into Georgia. Examples are the Blackwater River (Virginia), Waccamaw River (North Carolina and South Carolina), Northeast Cape Fear River (North Carolina), and Lumber / Little Pee Dee River (North Carolina and South Carolina). Many occurrences have been altered by changed hydrology, damming of rivers, erosive boat traffic, and water quality changes (increase in sediment load and pollution).

Distribution
Color legend for Distribution Map
United States Distribution: GApotentially occurs, NC, SC, VA
Global Distribution: United States
Global Range: This community ranges from Virginia to South Carolina and possibly Georgia.

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
Section Name: Atlantic Coastal Flatwoods Section
Section Code: 232C Occurrence Status: Confident or certain


Vegetation

Vegetation Summary: Annuals dominate this community and can include Eragrostis hypnoides, Lipocarpha micrantha (= Hemicarpha micrantha), Fimbristylis autumnalis, Micranthemum umbrosum, Lindernia dubia var. dubia, Lindernia dubia var. anagallidea, Fimbristylis perpusilla. Perennials are also present, including Juncus repens, Helenium flexuosum, Gratiola aurea, Sabatia kennedyana, but the community is generally dominated by a sparse to dense turf of annuals, most of the cover 2-10 cm tall. Seedlings and scattered larger individuals of trees such as Betula nigra and Acer rubrum may occur. Other species present may include Bidens frondosa, Boehmeria cylindrica, Commelina diffusa, Cyperus erythrorhizos, Cyperus polystachyos, Diodia virginiana, Digitaria sanguinalis, Echinochloa muricata, Echinodorus cordifolius, Eleocharis obtusa, Erechtites hieraciifolia, Hydrocotyle verticillata var. verticillata, Hypericum mutilum, Hypoxis curtissii (= Hypoxis leptocarpa), Justicia ovata, Ludwigia decurrens, Ludwigia palustris, Mitreola petiolata, Oldenlandia boscii, Panicum dichotomiflorum, Panicum rigidulum var. elongatum, Panicum verrucosum, Paspalum fluitans, Pluchea camphorata, Polygonum hydropiperoides, Polygonum pensylvanicum, Rhynchospora corniculata, Rotala ramosior, Sabatia calycina, Scirpus cyperinus, and Triadenum walteri. A wide range of other species may occur, including aliens, since seeds wash into this community from a variety of sources. This community often provides habitat for globally or regionally rare plant species, many of them adapted for this unusual environment.

Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Charact-
eristic
Dominant Constant
Cover Class %
Con-
stancy
%
Micranthemum umbrosum G2 Flowering forb Herb (field)  
 
 
Sabatia kennedyana G2 Flowering forb Herb (field)      
 
 
Eragrostis hypnoides G2 Graminoid Herb (field)  
 
 
Fimbristylis perpusilla G2 Graminoid Herb (field)      
 
 
Juncus repens G2 Graminoid Herb (field)  
 
 
Lipocarpha micrantha G2 Graminoid Herb (field)  
 
 


At-Risk Species Reported for this Association
Scientific Name
  (Common Name)
NatureServe Global Status U.S. Endangered Species Act Status
Fimbristylis perpusilla
  (Harper's Fimbry)
G2  
Sabatia kennedyana
  (Plymouth Rose-gentian)
G3  


Environmental Setting

Wetland Indicator: Y
Environmental Summary: This annual-dominated community occupies drawdown banks of blackwater rivers and other seasonally flooded muddy to silty banks.


Dynamic Processes


Plot Sampling & Classification Analysis

Plots stored in VegBank


Authors/Contributors
Concept Author(s): A.S. Weakley
Element Description Edition Date: 01Jan1996
Element Description Author(s): A.S. Weakley
NatureServe Conservation Status Factors Edition Date: 23Jan2000
NatureServe Conservation Status Factors Author(s): A.S. Weakley

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


References
  • Fleming, G. P., P. P. Coulling, D. P. Walton, K. M. McCoy, and M. R. Parrish. 2001. The natural communities of Virginia: Classification of ecological community groups. First approximation. Natural Heritage Technical Report 01-1. Virginia Department of Conservation and Recreation, Division of Natural Heritage, Richmond, VA. 76 pp.

  • Fleming, G. P., and K. D. Patterson. 2011a. Natural communities of Virginia: Ecological groups and community types. Natural Heritage Technical Report 11-07. Virginia Department of Conservation and Recreation, Division of Natural Heritage, Richmond. 34 pp.

  • Ludwig, J. C. 1996. Shoreline flora of the Blackwater River in Southampton and Isle of Wight counties, Virginia. Banisteria 8:44-46.

  • Schafale, M. 2003b. Fourth approximation guide. Coastal Plain communities. March 2003 draft. North Carolina Natural Heritage Program, Raleigh.

  • 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.

  • Schafale, M. P., and A. S. Weakley. 1990. Classification of the natural communities of North Carolina. Third approximation. North Carolina Department of Environment, Health, and Natural Resources, Division of Parks and Recreation, Natural Heritage Program, Raleigh. 325 pp.

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


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