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Reference
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Description |
Comm #7171
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Appalachian - Alleghenian Sandstone Dry Cliff Sparse Vegetation
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accession code: VB.CC.30974.CEGL006435
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Eastern Ecology Working Group of... |
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This dry sandstone cliff community occurs in the Western Allegheny Plateau and central Appalachian Mountains of the United States. Stands occur as steep to vertical rock exposures of sandstone bedrock. Aspect is variable, but stands are best developed on south- and west-facing slopes. Vascular plants are restricted to shelves, cracks and crevices in the rock, generally averaging less than 20% cover. Mosses and lichens are common, including crustose lichens. The sparse woody species include <i>Tsuga canadensis, Betula alleghaniensis (= Betula lutea), Betula lenta, Rhododendron maximum, Rhododendron periclymenoides (= Rhododendron nudiflorum), Kalmia latifolia, Toxicodendron radicans</i>, and rarely <i>Hydrangea arborescens</i>. Herbs are sparse but may include the forbs <i>Agrostis perennans, Aquilegia canadensis, Eurybia divaricata, Mitchella repens, Sedum ternatum</i>, and <i>Viola blanda</i>. <i>Silene rotundifolia</i> often occurs at the drip line. Ferns such as <i>Asplenium montanum, Asplenium pinnatifidum, Asplenium rhizophyllum, Asplenium trichomanes, Cystopteris tenuis, Dennstaedtia punctilobula, Dryopteris intermedia, Dryopteris marginalis, Polypodium virginianum, Polypodium appalachianum, Woodsia obtusa</i>, and the rare <i>Asplenium bradleyi</i> also occur. Massive cliffs in the gorges of the Gauley and Meadow rivers (West Virginia) can have dramatic overhangs which create unique dry habitats utilized by Allegheny wood rats (<i>Neotoma magister</i>) and antlions (larvae of insects in the family Myrmeleontidae). |
Comm #7172
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Ephedra torreyana Sparsely Vegetated Alliance
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accession code: VB.CC.24775.EPHEDRATORREYAN
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Western Ecology Working Group of... |
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Comm #7173
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CEGL000673
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accession code: VB.CC.3278.CEGL000673
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
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Comm #7174
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Juniperus virginiana - Pinus virginiana / Smilax rotundifolia Serpentine Forest
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accession code: VB.CC.30998.CEGL006440
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Eastern Ecology Working Group of... |
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This serpentine plant community of Pennsylvania and Maryland is associated with soils derived from weathered serpentine bedrock and typically occurs on the upper portions of moderate to steep slopes (typically 5-25°) commonly with a northerly and/or easterly aspect. Soils are typically well-drained and somewhat moist to dry. Soil texture is characteristically silt loam or clay loam and may be stony to stone-free. Soil depth varies from 4 cm to >30 cm but is typically 10 to 20 cm deep. The dominant canopy trees are <i>Pinus virginiana</i> and <i>Juniperus virginiana</i>. <i>Sassafras albidum</i> and <i>Acer rubrum</i> also are present but are not abundant in the canopy. The low-shrub layer is sparse and consists mainly of occasional hardwood seedlings. The dense shade of the conifer overstory and the accumulation of needle litter have produced a depauperate herbaceous layer. <i>Smilax rotundifolia</i> is the dominant species in the herbaceous layer and also acts as a liana, climbing into the conifer canopy and forming an often impenetrable curtain. Characteristic herbaceous species include <i>Microstegium vimineum, Danthonia spicata</i>, and <i>Polystichum acrostichoides</i>. |
Comm #7175
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Elaeagnus umbellata - Cornus racemosa - Rosa multiflora - Juniperus virginiana Shrubland
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accession code: VB.CC.31009.CEGL006451
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Eastern Ecology Working Group of... |
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This association comprises shrubby old fields dominated by thickets of <i>Elaeagnus angustifolia, Cornus racemosa, Viburnum prunifolium, Lonicera japonica, Lonicera morrowii, Ligustrum vulgare, Euonymus alatus, Rosa multiflora, Rhus glabra</i>, and <i>Rhus typhina</i>, with patches of herbaceous vegetation among the shrubs. Shorter shrubs include <i>Berberis thunbergii</i> and <i>Rubus</i> spp., and in some fields <i>Gaylussacia baccata, Vaccinium pallidum, Vaccinium stamineum</i>, and/or <i>Vaccinium angustifolium</i>. Small trees are often present but form <25% cover; they include <i>Juniperus virginiana, Betula populifolia, Prunus virginiana, Cornus florida, Acer rubrum, Juglans nigra, Prunus serotina, Robinia pseudoacacia</i>, and <i>Fraxinus americana</i>. The herbaceous layer is variable depending on the density of shrub cover. Typical species are those associated with old fields, grasslands, and agricultural sites. Common species include <i>Solidago rugosa, Solidago gigantea, Solidago nemoralis, Monarda fistulosa, Anthoxanthum odoratum, Poa pratensis, Oxalis stricta, Viola sororia, Euthamia graminifolia, Festuca rubra, Schizachyrium scoparium, Pycnanthemum virginianum, Alliaria petiolata, Galium mollugo, Potentilla simplex, Achillea millefolium, Daucus carota, Trifolium repens, Bromus inermis, Agrostis gigantea</i>, and <i>Elymus repens (= Elytrigia repens)</i>, among many others. Vines can be absent or dominant, sometimes covering the tall and short shrubs. Common vines are <i>Vitis aestivalis, Vitis labrusca, Toxicodendron radicans, Celastrus orbiculata, Parthenocissus quinquefolia</i>, and <i>Lonicera japonica</i>. |
Comm #7176
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Eastern Woodland Vernal Pool Sparse Vegetation
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accession code: VB.CC.31008.CEGL006453
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Eastern Ecology Working Group of... |
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This association is characterized by seasonally fluctuating water levels; it may dry out completely in the summer. Hydrology may be affected by impermeable soils, seasonally high water tables, seasonal flooding in nearby streams and drainages, and/or impervious bedrock at or near the surface. The substrate is mineral soil with or without a layer of muck. The species composition is variable among sites, as well as annually and seasonally. Larger examples of this community type may exhibit strong zonation. Many smaller, shaded vernal ponds are unvegetated, their bottoms consisting of dead leaves and algae. |
Comm #7177
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Eleocharis interstincta - Sagittaria lancifolia Seasonally Flooded Herbaceous Alliance
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accession code: VB.CC.27073.ELEOCHARISINTER
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Southeastern Ecology Working Gro... |
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This alliance consists of freshwater pond vegetation in southern Florida and the West Indies, dominated and characterized by Eleocharis interstincta. Other species present in the southeastern United States include Pontederia cordata (= Pontederia cordata var. lancifolia) and Crinum americanum. |
Comm #7178
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Pritchardia hillebrandii Coastal Mesic Forest
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accession code: VB.CC.20634.PRITCHARDIAHILL
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Western Ecology Working Group of... |
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Comm #7179
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Leersia oryzoides - Sagittaria latifolia Herbaceous Vegetation
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accession code: VB.CC.31001.CEGL006461
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Eastern Ecology Working Group of... |
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This community occupies wet alluvial bottomlands and beaver ponds in the Central Appalachians and adjacent ecoregions. Parent materials are alluvium derived mainly from acidic sandstones and shales. Surface soils are poorly drained, acidic clay loams. This small-patch wetland community is dominated by grasses and forbs, with scattered trees and shrubs. The dominant grasses are <i>Leersia oryzoides</i> and <i>Phalaris arundinacea</i> with <i>Leersia</i> strongly dominant at most sites. <i>Sagittaria latifolia</i> has high constancy and cover, except at higher elevations. <i>Scirpus cyperinus</i> has high constancy. Additional characteristic herbs include <i>Boehmeria cylindrica, Carex gynandra, Carex intumescens, Carex baileyi, Dichanthelium clandestinum, Dulichium arundinaceum, Eupatorium fistulosum, Galium tinctorium, Impatiens capensis, Juncus effusus, Lobelia siphilitica, Ludwigia palustris, Lycopus uniflorus, Lycopus virginicus, Lysimachia terrestris, Mimulus ringens, Polygonum sagittatum, Scirpus atrovirens</i>, and <i>Typha latifolia</i>. Areas with longer standing water may have aquatic species, including <i>Callitriche heterophylla</i> and <i>Sparganium</i> spp. Scattered small trees include <i>Robinia pseudoacacia, Salix nigra</i>, and <i>Fraxinus pennsylvanica</i>. The exotic shrub <i>Rosa multiflora</i> is sometimes invasive in this community. <i>Cornus amomum</i> is a characteristic native shrub. |
Comm #7180
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CEGL000808
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accession code: VB.CC.3412.CEGL000808
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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