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Talinum teretifolium - Minuartia glabra - Diodia teres - Croton willdenowii Flatrock Vegetation
Translated Name: Quill Fameflower - Appalachian Stitchwort - Rough Buttonweed - Willdenow's Croton Flatrock Vegetation
Common Name: Virginia Piedmont Granitic Flatrock Glade
Unique Identifier: CEGL003857
Classification Approach: International Vegetation Classification (IVC)
Summary: This association represents a zonal component of granitic flatrock communities of the Piedmont of Virginia. Characteristic species include the annuals Minuartia glabra, Diodia teres, Hypericum gentianoides, Croton willdenowii, and Bulbostylis capillaris, with the perennial Talinum teretifolium. In addition Cyperus granitophilus, Portulaca smallii, Aristida dichotoma, Panicum philadelphicum, Selaginella rupestris, Opuntia humifusa var. humifusa, and Diamorpha smallii may be found.



Classification

Classification Confidence: Moderate
Classification Comments: Distinct vegetation zones on Virginia granitic outcrops are recognizable but occur at a scale considerably smaller than that of a standard 10x10-m plot. These zonal assemblages are therefore treated here as within-community variation.

Vegetation Hierarchy
Class 2 - Shrub & Herb Vegetation
Subclass 2.B - Temperate & Boreal Grassland & Shrubland
Formation 2.B.2 - Temperate Grassland & Shrubland
Division 2.B.2.Nc - Eastern North American Grassland & Shrubland
Macrogroup Appalachian Rocky Felsic & Mafic Scrub & Grassland
Group Piedmont Dome & Flatrock Vegetation
Alliance Piedmont Willdenow's Croton - Appalachian Stitchwort - Fameflower Open Flatrock

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

Similar Associations
Unique Identifier Name
CEGL004298 Packera tomentosa - Croton willdenowii - Schizachyrium scoparium - (Selaginella rupestris) Flatrock Vegetation
CEGL004344 Diamorpha smallii - Minuartia glabra - Minuartia uniflora - Cyperus granitophilus Flatrock Vegetation



Related Concepts from Other Classifications

Other Related Concepts
Related Concept Name: Talinum teretifolium - Minuartia glabra - Diodia teres - Croton willdenowii Sparse Herbaceous Vegetation
Relationship: ? - Undetermined
Reference: VDNH [Virginia Division of Natural Heritage]. No date. Unpublished data. Virginia Department of Conservation and Recreation, Division of Natural Heritage, Richmond.
Related Concept Name: Granitic Flatrock
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.

Ecological Systems Placement

Ecological Systems Placement
Ecological System Unique ID Ecological System Name
CES202.329 Southern Piedmont Granite Flatrock and Outcrop


NatureServe Conservation Status
Global Status: G2 (09Mar2010)
Rounded Global Status: G2 - Imperiled
Reasons: This association is limited to granitic rocks in a six-county area in the southern Virginia Piedmont. There are 15 known occurrences, only one of which is protected. Several of the occurrences are small, and several have been disturbed by various anthropogenic activities. All occurrences are vulnerable to quarrying, roads, trash dumping, and exotic weeds.

Distribution
Color legend for Distribution Map
United States Distribution: VA
Global Distribution: United States
Global Range: In Virginia, this association is found very locally throughout the southeastern Piedmont. Plot samples are from Brunswick, Lunenburg, Nottoway, and Powhatan counties.

U.S. Forest Service Ecoregions
Domain Name: Humid Temperate Domain
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


Vegetation

Vegetation Summary: Overall, lichens (Xanthoparmelia conspersa, Cladonia caroliniana, Cladonia spp.) and mosses (especially Grimmia laevigata) dominate the surface of stands. Vascular plants dominate locally in crevices, gravelly flats, and depressions where moisture and thin detritus accumulate. The most constant and characteristic herbaceous species are the perennial Talinum teretifolium and the annuals Minuartia glabra, Diodia teres, Hypericum gentianoides, Croton willdenowii, and Bulbostylis capillaris. In addition, Cyperus granitophilus, Portulaca smallii, Aristida dichotoma, Panicum philadelphicum, Selaginella rupestris, Opuntia humifusa var. humifusa, and Diamorpha smallii (restricted to one Virginia site) are less constant but locally abundant. Deeper marginal soils are often invaded by Schizachyrium scoparium var. scoparium, Andropogon virginicus, Dichanthelium laxiflorum, and other perennials (VADNH unpubl. data).

Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Charact-
eristic
Dominant Constant
Cover Class %
Con-
stancy
%
Croton willdenowii G2 Flowering forb Herb (field)    
 
 
Diodia teres G2 Flowering forb Herb (field)    
 
 
Minuartia glabra G2 Flowering forb Herb (field)    
 
 
Portulaca smallii G2 Flowering forb Herb (field)      
 
 
Talinum teretifolium G2 Flowering forb Herb (field)    
 
 
Cyperus granitophilus G2 Graminoid Herb (field)      
 
 


At-Risk Species Reported for this Association
Scientific Name
  (Common Name)
NatureServe Global Status U.S. Endangered Species Act Status
Cyperus granitophilus
  (Granite-loving Flatsedge)
G3G4Q  
Portulaca smallii
  (Small's Purslane)
G3  


Environmental Setting

Wetland Indicator: N
Environmental Summary: This association is found on exposed, gently sloping to flat outcrops of granite and related rocks such as granitic gneiss and granodiorite. These habitats are located on gentle slopes along streams, where the erosive power of water over time has worn rock surfaces smooth and created gravel-filled depressions. Very thin, acidic soil mats are present around the periphery of the outcrops. The moisture regime is generally xeric, although substantial seasonal moisture, ephemeral seepage, and periodic standing water may be present in certain zones.


Dynamic Processes


Plot Sampling & Classification Analysis

Plots stored in VegBank


Authors/Contributors
Concept Author(s): G.P Fleming
Element Description Edition Date: 23May2002
Element Description Author(s): M. Pyne
NatureServe Conservation Status Factors Edition Date: 09Mar2010
NatureServe Conservation Status Factors Author(s): G.P. Fleming

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. 2002b. Preliminary classification of Piedmont & Inner Coastal Plain vegetation types in Virginia. Natural Heritage Technical Report 02-14. Virginia Department of Conservation and Recreation, Division of Natural Heritage, Richmond. 29 pp.

  • 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., P. P. Coulling, K. D. Patterson, and K. M. McCoy. 2004. The natural communities of Virginia: Classification of ecological community groups. Second approximation. Natural Heritage Technical Report 04-01. Virginia Department of Conservation and Recreation, Division of Natural Heritage, Richmond, VA. [http://www.dcr.virginia.gov/dnh/ncintro.htm]

  • Fleming, G. P., and K. D. Patterson. 2003. Preliminary vegetation classification for the National Capitol Region parks. Regional (VA-WVA-MD-DC) analysis prepared for NatureServe and USGS-NPS Vegetation Mapping Program, March 2003. Virginia Department of Conservation and Recreation, Division of Natural Heritage, Richmond.

  • 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.

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

  • VDNH [Virginia Division of Natural Heritage]. No date. Unpublished data. Virginia Department of Conservation and Recreation, Division of Natural Heritage, Richmond.


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