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Hydrilla verticillata Ruderal Aquatic Vegetation
Translated Name: Water-thyme Ruderal Aquatic Vegetation
Unique Identifier: CEGL004702
Classification Approach: International Vegetation Classification (IVC)
Summary: This aquatic vegetation, dominated by the invasive alien plant Hydrilla verticillata, is found in natural lakes and anthropogenic impoundments. Stands of this ruderal vegetation are dominated by Hydrilla verticillata often to the exclusion of all other species. Since its introduction, this plant species has rapidly spread across the southeastern United States. Its spread into anthropogenic impoundment lakes is exacerbated by the transport of propagules on boat propellers. It produces vegetative propagules known as turions, which can resist desiccation for long periods of time.



Classification

Classification Confidence: Low - Poorly Documented

Vegetation Hierarchy
Class 5 - Aquatic Vegetation
Subclass 5.B - Freshwater Aquatic Vegetation
Formation 5.B.2 - Temperate to Polar Freshwater Aquatic Vegetation
Division 5.B.2.Na - North American Freshwater Aquatic Vegetation
Macrogroup North American Temperate Ruderal Aquatic Vegetation
Group Eastern North American Ruderal Aquatic Vegetation
Alliance Ruderal Water-thyme - Eurasian Water-milfoil Aquatic Vegetation

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These data are subject to substantial ongoing revision and may be out of date for some states.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
Alabama Hydrilla verticillata Ruderal Herbaceous Vegetation Equivalent Certain Schotz pers. comm.
Tennessee Hydrilla verticillata Ruderal Herbaceous Vegetation Equivalent Certain TDNH unpubl. data



Ecological Systems Placement

NatureServe Conservation Status
Global Status: GNA (18Jan2001)
Rounded Global Status: GNA - Not Applicable
Reasons: This ruderal vegetation is dominated by an invasive alien plant.

Distribution
Color legend for Distribution Map
United States Distribution: AL, FL, GA, LA, NC, SC, TN, TX
Global Distribution: United States
Global Range: This vegetation ranges throughout much of the southeastern United States.

U.S. Forest Service Ecoregions
Domain Name: Humid Temperate Domain
Division Name: Hot Continental Division
Province Name: Eastern Broadleaf Forest (Oceanic) Province
Province Code: 221 Occurrence Status: Confident or certain
Section Name: Northern Cumberland Plateau Section
Section Code: 221H Occurrence Status: Confident or certain
Province Name: Eastern Broadleaf Forest (Continental) Province
Province Code: 222 Occurrence Status: Confident or certain
Section Name: Interior Low Plateau, Highland Rim Section
Section Code: 222E Occurrence Status: Confident or certain
Division Name: Subtropical Division
Province Name: Southeastern Mixed Forest Province
Province Code: 231 Occurrence Status: Confident or certain
Section Name: Southern Appalachian Piedmont Section
Section Code: 231A Occurrence Status: Confident or certain
Section Name: Southern Cumberland Plateau Section
Section Code: 231C Occurrence Status: Confident or certain
Section Name: Middle Coastal Plains, Western Section
Section Code: 231E Occurrence Status: Confident or certain
Section Name: Eastern Gulf Prairies and Marshes Section
Section Code: 231F Occurrence Status: Confident or certain
Province Name: Outer Coastal Plain Mixed Forest Province
Province Code: 232 Occurrence Status: Confident or certain
Section Name: Coastal Plains and Flatwoods, Lower Section
Section Code: 232B Occurrence Status: Confident or certain
Section Name: Atlantic Coastal Flatwoods Section
Section Code: 232C Occurrence Status: Confident or certain
Section Name: Florida Coastal Lowlands (Western) Section
Section Code: 232D Occurrence Status: Confident or certain
Section Name: Louisiana Coast Prairies and Marshes Section
Section Code: 232E Occurrence Status: Confident or certain
Section Name: Florida Coastal Lowlands (Eastern) Section
Section Code: 232G Occurrence Status: Confident or certain
Division Name: Prairie Division
Province Name: Prairie Parkland (Subtropical) Province
Province Code: 255 Occurrence Status: Confident or certain
Section Name: Central Gulf Prairies and Marshes Section
Section Code: 255D Occurrence Status: Confident or certain
Domain Name: Dry Domain
Division Name: Tropical/Subtropical Steppe Division
Province Name: Southwest Plateau and Plains Dry Steppe and Shrub Province
Province Code: 315 Occurrence Status: Confident or certain
Section Name: Rio Grande Plain Section
Section Code: 315E Occurrence Status: Confident or certain


Vegetation

Vegetation Summary: Stands of this ruderal aquatic vegetation are dominated by the invasive alien plant Hydrilla verticillata, often to the exclusion of all other species.


Environmental Setting

Wetland Indicator: Y
Environmental Summary: This aquatic vegetation, dominated by the invasive alien plant Hydrilla verticillata, is found in natural lakes and anthropogenic impoundments.


Dynamic Processes

Dynamics: Since its introduction, this plant species has rapidly spread across the southeastern United States. Its spread into anthropogenic impoundment lakes is exacerbated by the transport of propagules on boat propellers. It produces vegetative propagules known as turions, which can resist desiccation for long periods of time.


Plot Sampling & Classification Analysis

Plots stored in VegBank


Authors/Contributors
Concept Author(s): A.S. Weakley
Element Description Edition Date: 01Mar1997
Element Description Author(s): A.S. Weakley
NatureServe Conservation Status Factors Edition Date: 18Jan2001
NatureServe Conservation Status Factors Author(s): M. Pyne

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


References
  • Schotz, Al. Personal communication. Community Ecologist. Alabama Natural Heritage Program. Huntingdon College, Massey Hall, 1500 East Fairview Avenue, Montgomery, AL 36106-2148.

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

  • TDNH [Tennessee Division of Natural Heritage]. No date. Unpublished data. Tennessee Division of Natural Heritage, Nashville, TN.


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