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Add/Drop	Name	Reference	Plots↓	Description
Comm #681	Prunus fasciculata Shrubland Alliance » more details accession code: VB.cc.30215.PRUNUSFASCICULA	NVC 2004	28
Comm #682	Tamarix spp. Semi-natural Temporarily Flooded Shrubland Alliance » more details accession code: VB.cc.30868.TAMARIXSPPSEMIN	NVC 2004	28
Comm #683	Artemisia cana Shrubland Alliance » more details accession code: VB.cc.30614.ARTEMISIACANASH	NVC 2004	28
Comm #684	Pinus serotina - Gordonia lasianthus / Lyonia lucida Swamp Woodland » more details accession code: urn:lsid:vegbank.org:commConcept:32543-{7DFBF126-3791-4F08-BC4F-550ECEEC2020}	NatureServe Biotics 2019	28	This community occurs in Outer Coastal Plain peat domes and large peat-filled Carolina bays of eastern North Carolina and northern South Carolina. The open canopy consists of mixtures of <i>Pinus serotina</i> and <i>Gordonia lasianthus</i>, generally codominant. Various pocosin shrubs form a dense shrub stratum; typical species include <i>Lyonia lucida, Ilex glabra, Ilex coriacea, Smilax laurifolia, Persea palustris</i>, and others. The herb stratum is typically very sparse. In some areas, as in the Green Swamp, Brunswick County, North Carolina, this community occurs as islands in <i>Pinus serotina / Cyrilla racemiflora - Lyonia lucida</i> Woodland (Kologiski 1977). In other areas, it forms the landscape matrix in unbroken blocks of up to 100 square kilometers.
Comm #685	Typha (latifolia, angustifolia) Western Marsh » more details accession code: urn:lsid:vegbank.org:commConcept:30919-{E80B0765-3AB2-4CA0-9B2A-7CEF57517DC2}	NatureServe Biotics 2019	28	This association is widespread across the western United States and western Great Plains occurring near streams, rivers, and ponds. The soil is flooded or saturated for at least part of the growing season. The alluvial soils have variable textures ranging from sand to clay and usually with a high organic content. The dominant species, <i>Typha latifolia</i> or <i>Typha angustifolia</i>, often forms dense, almost monotypic stands. Other species typical of wetlands may be found in lesser amounts in this community; among these are shallower water emergents such as <i>Carex</i> spp., <i>Eleocharis macrostachya, Eleocharis palustris, Glyceria</i> spp., <i>Juncus arcticus ssp. littoralis, Juncus torreyi, Mentha arvensis, Schoenoplectus acutus</i>, and <i>Veronica</i> spp. In deeper water, <i>Lemna minor, Potamogeton</i> spp., <i>Sagittaria</i> spp., <i>Azolla filiculoides</i>, and other aquatics may be present in trace amounts.
Comm #686	Pinus resinosa - Pinus strobus / Corylus cornuta / Vaccinium angustifolium Forest » more details accession code: urn:lsid:vegbank.org:commConcept:31351-{9C90B43C-4FD0-403D-9913-3E8CE5EB9015}	NatureServe Biotics 2019	28	This upland red pine - white pine community is found in the subboreal regions of the midwestern United States and in central and possibly eastern Canada. This community occurs on Precambrian bedrock, overlaid with medium deep, coarse sand or coarse loam soils. Moisture varies from dry to dry-mesic, and stands are on mid to upper gentle slopes. Stands contain a pine overstory and a poorly developed understory. <i>Pinus resinosa</i> is the dominant overstory species, but can occur mixed with <i>Pinus strobus</i>. Other species include <i>Abies balsamea, Pinus banksiana, Picea mariana, Picea glauca</i>, and <i>Populus tremuloides</i>. Northern hardwoods, such as <i>Acer rubrum</i> and <i>Betula papyrifera</i>, sometimes form a subcanopy. The understory ranges from moderately herb- and shrub-rich to extremely poor. In the tall-shrub strata, the important species are <i>Amelanchier</i> spp. and <i>Corylus cornuta</i>. The short-shrub layer includes <i>Linnaea borealis, Gaultheria procumbens, Vaccinium angustifolium</i>, and <i>Vaccinium myrtilloides</i>, particularly where gaps in the canopy occur. The herb layer is very poorly represented in most parts of this community's range and includes <i>Aralia nudicaulis, Eurybia macrophylla, Cornus canadensis, Maianthemum canadense, Pteridium aquilinum</i>, and <i>Trientalis borealis</i>. Mosses are abundant, especially <i>Dicranum</i> spp. (including <i>Dicranum polysetum</i>) and <i>Pleurozium schreberi</i>. Diagnostic features include the dominance of <i>Pinus resinosa</i> and the ericaceous understory.
Comm #687	Tilia americana var. heterophylla - Aesculus flava - Acer saccharum / Cystopteris bulbifera - Asarum canadense Forest » more details accession code: VB.CC.36549.CEGL006472		28	This association is currently known only from carbonate rock districts in the west-central and southwestern Virginia portions of the Ridge and Valley province, extending into peripheral areas on the flanks of the Southern Blue Ridge and Cumberland Mountains. Occurrences in limestone valleys of West Virginia, Kentucky, and Tennessee seem likely. Sites are restricted to mesic, fertile slopes underlain by limestone or dolomite, small outcrops, and loose talus which is often exposed. Habitats are usually situated on lower to middle slopes subtending streams in low-elevation (&lt;700 m [2200 feet]) montane valleys, coves, and gorges. Slopes are steep to extremely steep (mean = 33°), usually with north to east aspects. Bedrock outcrops are frequent, and significant subsurface lateral seepage may occur seasonally at some sites. Substrate varies from site to site, but generally consists of a mosaic of deep colluvial soil and fine talus or scree that is somewhat to very loose and unstable. Soils collected from plot samples are circumneutral, with very high calcium, magnesium, and total base saturation levels. Stands have a variable overstory composition, with <i>Tilia americana var. heterophylla, Aesculus flava, Acer saccharum</i>, and <i>Fraxinus americana</i> consistently important. Other less constant or abundant trees that may be important in some stands include <i>Ulmus rubra, Carya cordiformis, Liriodendron tulipifera, Quercus muehlenbergii, Quercus rubra, Acer nigrum, Thuja occidentalis</i>, and <i>Celtis occidentalis</i>. On several unusually sheltered, north-facing slopes, <i>Tsuga canadensis</i> is a codominant in the canopy mix. The understory and shrub layers of this community tend to be open or sparse, but patches of <i>Staphylea trifolia</i> and <i>Lindera benzoin</i> are frequent, along with climbing lianas of <i>Aristolochia macrophylla</i>. The herb layer is lush and diverse, with an array of patch-dominants that vary both among and within stands. On rockier substrates, <i>Cystopteris bulbifera</i> is consistently abundant, often covering up to 50% of an individual plot sample. More-or-less constant herbs that achieve &gt;10% in one or more plots include <i>Asarum canadense, Solidago flexicaulis, Osmorhiza claytonii, Actaea racemosa, Caulophyllum thalictroides, Laportea canadensis, Impatiens pallida, Polymnia canadensis, Hydrophyllum canadense, Jeffersonia diphylla, Thalictrum dioicum, Viola canadensis, Phacelia bipinnatifida, Dicentra canadensis, Dicentra cucullaria, Trillium grandiflorum, Delphinium tricorne, Stellaria corei</i>, and <i>Meehania cordata</i>. Other characteristic herbs that usually occur at low cover are <i>Arisaema triphyllum, Sedum ternatum, Cardamine concatenata, Polystichum acrostichoides, Hepatica nobilis var. acuta (= Hepatica acutiloba), Mitella diphylla, Asplenium rhizophyllum, Adiantum pedatum, Uvularia grandiflora, Prosartes lanuginosa, Prosartes maculata, Podophyllum peltatum, Carex albursina, Hybanthus concolor, Trillium sulcatum, Synandra hispidula</i>, and <i>Stylophorum diphyllum</i>.
Comm #688	(Cephalanthus occidentalis) / Dulichium arundinaceum - (Polygonum hydropiperoides, Glyceria acutiflora, Proserpinaca palustris) Marsh » more details accession code: urn:lsid:vegbank.org:commConcept:32608-{9821E62B-3C94-4BDF-8883-BE144194EE2C}	NatureServe Biotics 2019	28	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.
Comm #689	Vaccinium corymbosum - Rhododendron viscosum - Clethra alnifolia Acidic Peatland » more details accession code: urn:lsid:vegbank.org:commConcept:35015-{827AFD3D-F18B-4A0B-B270-265AF48BFA50}	NatureServe Biotics 2019	28	This is a tall-shrub swamp of seasonally flooded basins in the eastern United States. It occurs in small open basins, closed sandplain basins, and seasonally flooded zones within larger wetlands. It may also form as a result of beaver activity. This vegetation can occur on the margins of Coastal Plain ponds. This community is influenced by a strongly fluctuating water table with flooded conditions in spring and early summer followed by a drop in the water table below soil surface usually by late summer. There is usually a shallow organic layer often over sand. Dominant shrubs include <i>Vaccinium corymbosum, Ilex verticillata</i>, and <i>Rhododendron viscosum</i>. Scattered <i>Acer rubrum</i> are not uncommon. <i>Lyonia ligustrina</i> and <i>Cephalanthus occidentalis</i> are characteristic although not necessarily dominant. Associated shrub species may include <i>Clethra alnifolia, Spiraea tomentosa, Chamaedaphne calyculata, Ilex glabra, Leucothoe racemosa, Decodon verticillatus, Kalmia angustifolia, Alnus serrulata, Myrica gale</i>, and <i>Aronia</i> spp. Herbaceous composition is variable; some of the more typical species include <i>Osmunda cinnamomea, Osmunda regalis, Thelypteris palustris, Onoclea sensibilis, Calla palustris, Lycopus uniflorus, Triadenum virginicum, Glyceria striata, Leersia oryzoides, Dulichium arundinaceum, Juncus effusus</i>, and <i>Woodwardia virginica</i>. A layer of peatmoss is common and varies in cover; species include <i>Sphagnum fimbriatum, Sphagnum rubellum, Sphagnum magellanicum, Sphagnum fallax</i>, and <i>Sphagnum viridum</i>.
Comm #690	Eleocharis flavescens - Xyris difformis Marsh » more details accession code: urn:lsid:vegbank.org:commConcept:35044-{19A67EF9-1496-4FF7-998C-522B41C48B1B}	NatureServe Biotics 2019	28	This low, graminoid-dominated vegetation of deep muck is often associated with mid-Atlantic Coastal Plain ponds. Characteristic species include <i>Eleocharis flavescens, Juncus pelocarpus, Fimbristylis autumnalis, Rhynchospora scirpoides, Xyris difformis</i>, as well as occasional individuals of aquatic species such as <i>Nymphaea odorata</i>. This vegetation may only appear during the latter part of the growing season when water levels have dropped, and may not appear at all during years of particularly high rainfall.